Yes to decoupling.
I know you voted against more HR integration long time but here is my specific wish list for HR which gives most bang for bug as training metric:
1
Most valuable is intervals.icu cumulative time above HR graph. Super helpful if you train VO2max truly by HR as proxy for VO2max state.
Site note:
I requested that chart here in this forum (Thoughts on intervals.icu data breakdown - #120 by Rizzi) and it was live one week later as seen here with screenshot (Thoughts on intervals.icu data breakdown - #130 by davidtinker)! How cool is that!
2
Power vs HR by season like:
3
Besides that I look at estimated load by HR vs TSS but that depends on dialed in HR zones and would probably be not for the masses.