…The reason most can’t do HV is their FTP is too high…
It’s worth noting that back when TR released their ramp test, there was a lot of discussion on the subject, and some of the heavy hitters in the industry (e.g. Coggan) explicitly predicted that it would lead to folks overtraining or at least not seeing the results people wanted. e.g. TrainerRoad New FTP test (Page 3): Triathlon Forum: Slowtwitch Forums. (The slowtwitch thread is a wonderful read that has aged well!)