That’s cool, whatever works I guess. As long as there’s very explicit instructions to adjust based on feeling - LT1 is well correlated with FTP but not perfectly so, same as VO2max.
But also like, do people just not enjoy riding their bikes or something? Heck, I’ve got ADHD so bad I’m on dexies AND ritalin, and I still manage to get in 3h endurance rides on the trainer if I can’t get outside 
. Just load up some TV and spin away! No workout required, honestly, but if it helps pass the time I’ll often whack it in ERG mode in Zwift and just adjust up/down based on feel, that way I don’t even have to concentrate on my power.