I’m not sure if Dr. Coggan would agree with you on that. Hour power is a way to measure/estimate FTP, but that’s not what FTP “is”. And in any case, i don’t think FTP was ever meant to signify the power you could hold for an hour every day. If I came into a real 40k TT, with other people around me and I was rested/tapered for the event, then I guarantee I’m putting out a much higher number than if I just went down to my trainer right now and busted out an hour. My anaerobic threshold didn’t change just because some people on a side of the road were yelling at me.
Also, I think some people are really missing the forest through the trees on this ramp test business. The ramp test is a way to consistently measure your adaptation to training on the bike. It gets me close enough (FTP itself is just a guess anyway btw!) that the over part of an over under interval really hurts and the under part isn’t so bad. When I get in better shape the ramp test number goes up for me and I train at higher levels for the next few weeks. I inevitably (hopefully!) adapt to that and the ramp test spits out a higher number the next time. Rinse and repeat.
The ramp test is based on correlation between the results on that test and people’s FTP measured through other means. Some people on either tail end of the bell curve will need to adjust accordingly, but I think the test gets it close enough for most people.
Finally, FTP and w/kg are fun for online d*ck measuring contests, but there is a reason why bike races aren’t held in performance labs.