I'm just starting to try our Trainerroad, and so far I think AI FTP detection is amazing. Not so much for it's accuracy, although that seems to be good, but just as much for the promise of having a consistent track of FTP changes, even if you miss or never do tests. I have patches of my training history where I can sort of infer how well I was going, but I might be lacking in tests.
I could certainly keep self coaching at this point, and I don't need it for workouts or tracking training load, but I do like that it keeps track of progression through workouts. Up until now, I've ramped CTL and intensity through the season, but it feels like there's something beneficial in doing progressively harder workouts, even if it's just the mental benefit of seeing I'm capable or tackling more and more.