Specific to structured strength workouts that include mobility and maintenance physical therapy, I really want be able to see two main metrics - compliance vs time and parameter vs time (like weight or duration).

Mobility and PT are mostly "hey, did I show up and do the work consistently for months and when/where did I have misses" and that data doesn't really show anywhere else, like TSS or duration. However, there is definitely another metric tracking that would be nice, like seeing what weight I could do for single leg calf raise as part of an ankle improvement routine. Basically think of it similar to tracking my FTP or critical power, it would be nice to watch compliance of a program manifest as gains, or conversely track plateaus and losses as a result of focusing elsewhere and a signal for when to refocus again.