Your theory is reasonable and probably correct but I imagine a hypothetical V3 would run a similar firmware that supports these new features.
Think iOS updates. If your last gen iPhone gets a new feature via an update then that new feature will probably be available in the next gen iPhone.
Iām pretty annoyed that they didnāt bring Light support to my Roam V1 that I had just bought before the V2ās launched.
Itās just so much better than the 1040, 830 before that, for me.
Where do I start.
The zoom in out thing ā¦ incredible, wont ever use a head unit without this feature in the future.
The fonts and design, for example, the ride timer, you can immediately read it, including how many hours it is, on the edge the hour number is so small iād have to think how many hours in I am. Or to change my normal ride screen from a zoomed out one with fields I sometimes look at like clock, IF, miles to a zoomed in one when im on a quick club ride and just want 3s power, mph, HR and gears with two presses is great. I forever changed fields on my edge depending on what ride im doing, using different profiles, settings, waste of time.
The workout screen, so much better. Target power easily readable, tiny on the massive edge and unreadable. Again, zoom in and out to suit. Did steady state intervals today and found the LEDs incredibly useful. I need glasses for reading so to be able to zoom in to suit when I have normal sunglasses on is great and zoom back out like today when iām indoors wearing my varifocals.
The screen, superb, miles ahead of Garmin. The backlight comes on when it needs. it is the right level. On the edge I was turning backlight always on when it was late afternoon, fiddling with the slider constantly. Faffing about. Mind you, I always thought my 830 screen was quite good and not glossy like the 1040 solar.
Did 70 miles at weekend and found navigating easy, the chevrons, the clear screen. I always went wrong with my edge at least once a ride as just couldnāt figure out where I was supposed to go.
Summit feature ā¦ so much better than climbpro, telling me how long left on a climb, really enjoyed climbing using it. Could never read climbpro, or Strava segments on the edge, silly small writing. Muddled.
The size is just right for me too, always found my 830 too small and 1040 too big.
The pages themselves need barely a change data field wise, its all just there.
Downsides ? battery I suppose, its still perfectly good enough. Connect now only sees rides I do on Zwift but like today I did my intervals inside anyway so the data and VO2 max etc filters through, in any case I get my stats through training peaks and Strava just fine.
Which Wahoo did you buy?
Bought the Roam v2.
The last unit I liked this much was the Edge 1000, battery life was poor but I loved the size and features for its timeā¦ Never really felt Garmin moved forward much design wise from then which is a shame.
I went from a monochrome ELEMNT to the Garmin 1030 Plus, and while there are some things I like, I still feel like I took a step backward in some ways. The dynamic zoom on Wahoo data pages still feels like the ultimate in UX design for a bike computer.
I may have to sell my 1030 and switch backā¦
@TravisM Pretty sure that has to do with the memory available on the V1.
I really donāt understand how my sixty something year old eyes have no problem using a Garmin 530 and later 840. With 8 or 10 datafields. Not a single person I ride with uses the Wahoo zoom in/out feature. 
I use it constantly. If you design your pages right, a single page can replace two or more on a Garmin. On some pages, I can āhideā optional information like power zone charts. If I were to switch to something else, itād be the number 1 feature Iād miss.
Can you zoom in/out in TR app? Zoom in/out on the dashboard of your car? I talk with a lot of cyclists and ask them, the people I know that zoomed in, never zoom out. My Garmin has two primary pages: Structured workout page that looks somewhat like TR app, and no workout loaded page. Real-time graphs on both. Then a couple pages of summary info that I look at near the end of a ride.
Cool, I was talking about the 1040 solar though. I did mention the 830 was ok.
I totally get that some people wouldnāt even know the zoom feature exists, but the ones that do use it tend to like it a lot. Even if I never used it, Iād still think it would be a good idea for Garmin and Hammerhead to implement it.
In fact, Iād like them to implement it in case Wahoo goes belly up and I need to buy a new head unit. 
At the same time, Iād also like Garmin to make sure all products they currently offer (including my Varia radar) to e. g. be updatable via my smartphone. I also like Wahooās integration of their ill-fated Rival to their head units (they automatically detect they are close and the Rival will send heart rate data to my Bolt v1 after I have started an activity; not sure if Garmin products do the same).
No, but itās a feature Iād like. I donāt get why on an iPad I am limited to the same 6 fields as on my iPhone 12 mini. A zoom feature would be great to hide optional fields.
Right now I use my Wahoo head unit on almost all workouts to provide those extra screens (e. g. 20-second average and 3-second average power, 20-second average left/right balance). Plus time (time is of course also on my phone, but smaller and my eye sight isnāt great). Currently, I also compare the heart rate of my Polar H10 and my Wahoo Rival (usually close on my road bike on the trainer, but can be wildly off on my mountain bike, most likely due to the different hand positions).
I donāt own a car and havenāt in decades, so perhaps I am not the right person to ask. In recent months, I have rented a few different cars recently (mostly Fords and VWs). Car interfaces are the opposite of what a good UI should look like (e. g. touch buttons without haptic feedback, confusing controls, the list goes on). I usually just tried to get CarPlay to work (not always easy) and gave up on the built-in screens.
I have more, but disable most of them in the app. One reason is that while mountain biking different fields are important. I also keep two dedicated endurance screens. Plus, I donāt have a power meter on my mountain bike. I keep some dual use screens like my commute screen. For long days in the saddle, I have a battery screen.
Iāll throw in that Iām a Wahoo user and also use the zoom in/out, and do wonder how many people realize you can.
I use it. I have more fields normally, and then I zoom in if I am racing to just show the critical figures more prominently.
V3 is coming out in July / TdF
Iām a Bolt V2 user and I zoom in out all the time, its great to be able to have a key metric during a workout like Power or HR Zoomed in so it fills up the whole screen and with a couple of taps on the side buttons zoom out to see how long Iāve been riding, what time it is etc.
Zoom in is great for high intensity intervals. I also use it for winter riding sub-freezing when I need ski goggles. I canāt wear bifocals under ski goggles.
Zoom is a critical feature of the Bolt to me as well
Itās great UX design: simple but very effective. Like you say, a better solution than just creating more static pages to scroll through as it lets you keep related data together on the same page while hiding the lesser stuff most of the time (turning down the visual ānoiseā) so that what youāre presented with is as fuss-free, and as easy to take in at a glance, as can be. A big deal on very small screens.
I zoom data screens & maps on every ride with my Di2 hood buttons. Marvellous!
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Doesnāt bear thinking about! 
Roam, Bolt, both?