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FWIW, I know almost nobody I follow on Strava that trains formally that could do 95% of their 20min number for an hour. Totally anecdotal.
Now, I only follow folks up to probably Cat 2 or 3 road racers so the variability index and their power duration curve is going to be a sharper drop than a TT or triathlete.
I'd expect the longer the effort durations that are your specialty, the closer to 95% you'd get.
I think it works for training zone purposes to use about 92% for me. 92% is much closer if you tend to train anaerobic more (bike racer) and 95% if you train aerobic more (triathlete).
Yeah, I've never actually tried to ride for a full hour to see if it works. But what I have done is found my supposed FTP, then that was used to find what I "should" shoot to ride at for 56/112 miles then trained to hold that for the necessary time and it's worked out okay. So I could see training for the specific 1 hour fitness attempt might make it possible. But I know that just because the 20 minute test says my FTP is xyz, that I can't hold that truly for roughly an hour unless I'm trained for that effort.
But I think the OP was trying to take that further and state that some people are not even taking 5% off the 20 minute test any more. I remember now where I saw it....GCN had one of the presenters do the Sufferfest test that another poster mentioned. He did some intense efforts before the 20 minute test, so he was starting already significantly tired. So that was the reason to take the 20 minute test at full value.
I've started using Trainer Road's ramp test. Like you said, I never could truly hold the 20 minute test anyway, so I just use that value to set training intensity. I wouldn't trust it nearly as much as a good 20 minute test to go out and pace a time trial purely from that info, but I didn't ever do that anyway. From the training based off that ramp test, I really learn what I can hold for a race. I prefer the ramp so far since it feels more repeatable. I had many bad 20 minute tests where I maybe didn't feel that great or just did a bad job at pacing and the whole test was useless.