Maybe this has been changed but the only thing being rounded to the nearest 5 is the display, the actual watts in erg mode are exact.
So the targets are all rounded to nearest 5w but ERG uses the exact value. I’m not sure that’s true - and if it is true then I’m not sure if its better or worse 
Doesn’t help people not using ERG either.
Unless - do you mean that the “recorded” power is exact? Not the targets
I have not checked recently but unless zwift changed it works like this:
Your workout requests let’s say 256w, zwift will tell the trainer to hold 256w and if you check with your garmin it will be holding 256w but zwift will display 260w, essentially just rounding the display to the nearest 5w.
Just read through that thread… seems like a mess and nobody really knows what it actually does anymore. Posts near the start of the thread imply that you are correct and that the raw targets are still used for ERG - but others contridict that.
We’ll find out in January 
255w 
At least on my setup (Kickr Core) there’s a ton of rounding and averaging going on all the time regardless. Try putting a bike with a PM on your trainer some time, then running a TR workout with a bunch of steady efforts. You’ll find that when your trainer is holding X watts (as displayed by both TR and, if you have it running, Zwift) your actual power is fluctuating +/- 5-8% around that wattage target. That fluctuation is normally both above and below target so it does average out, But I wouldn’t personally be concerned at all if Zwift is rounding efforts to the nearest 5W, as your actual power is probably +/- 15w or more.
Sounds like you have ERG power smoothing on your kickr core giving those perfect straight lines 
You’re right about the fluctuations you see in real power around the smooth lines you see - but these average out over time - the offset caused by this rounding is constant so will affect the average power of the interval.
I’ve seen a few people say that this rounding doesn’t matter because of power meter accuracy - but this extra inaccuracy caused by rounding adds to the possible total inaccuracies - it doesn’t hide behind it.
If you have a power target set 2% wrong and your power meter if off by 2% now your workout can be up to 4% out 
Now, I agree that this isn’t the end of the world, and will probably only be noticeable by people with relatively lower FTPs, but it is really annoying 
Fwiw, I also found my Kickr Core was never really that close to my Stages power meter. I usually used the Wahoo power match function on the Core and then the number displayed on Zwift and on TrainerRoad would be fairly close. I’d personally pair the Kickr to TrainerRoad and my Stages to Zwift.
Last year however, I switched to the full on Kickr (whichever the latest version is), the one that self calibrates. I find the full featured Kickr to actually track much closer to my Stages Power Meter. Kind of makes me wonder if my Core was just losing calibration much faster than I thought it would.
Yes, you get XP also for Zwift workouts but they are calculated a bit different. And I agree, usually you get more XP for distance based zwift as you would get for workouts.
Some more questions came to mind:
Is extending the warmup possible or will we just have to ride 5 to 10 minutes in Zwift before we start the TR workout?
Will the laps look like they do in TR now? E.g. the revovery-laps are not shown. Makes it much more readable for me.
Will the workouts be recognizable in the TR calendar or are they just shown as Zwift rides, like every zwift ride today?
And will we have the survey after the workout integrated into zwift? Or do we need to do this in the TR app later?
Anyway, looking foreward to the integration, I dont have to deal with 2 or 3 devices for my training 
#firstworldproblem
In Zwift you can start the workout, if you decide that you want a longer warm up, you just pause the workout, and keep riding, it will turn erg off. You can use this between intervals as well, if you are doing 2 x 20 and decide that you need a bit longer warm up, rather than stop you just pause the workout and keep riding, it will pause the timer to the next interval … thats all, it will keep recording the workout and that you had a longer rest
I’m really curious if/how that’d affect your progression levels, given the upcoming changes to workout scoring:
I’m jumping to the conclusion that they are making those changes, because of what will happen when people start doing workouts in Zwift, IMO thats how TR should have worked as anyway, if you pause or take extra recovery, record it. I wouldn’t be suprised if people have cheated the 20min test (or rather themselves) but having a breather half way through as TR doesn’t recognise this
The Kickr Core also auto calibrates with a firmware update that has been out for like a year or so IIRC. Mine is pretty close to my 4iii pm.
@Nate_Pearson what’s the latest on this? I’d ideally like to start soon now that we’re hitting the winter months
but you sent me links on Strava. What about the Zwift integration?
Ah, so you’re saying there’s a fire drill going on?
Thinking actual real fires and spent fire extinguishers spread all over the office
He mentions Zwift as part of all that mess. They were already in progress there, but this adds to the work.
Notably, the final statement shows Nate may be away for a while due to this all.