Yeah, I think as long as you find something that’s consistent on a day-to-day basis - that’s all that matters!
I think it’s easy enough to work any ‘readiness score’ into Xert already. I’ll outline very simply how I’ve already been doing this:
- If my training status is yellow in Xert, I already know I’ll be doing low-intensity riding.
- If my training status is blue, but HRV is outside of baseline (or I just don’t feel ready to go) I simply filter by 2-diamond endurance workouts (or free ride below LTP) and aim to hit close to my recommended XSS target
- If my training status is blue and HRV is good, I’ll look at the HIIT recommendations from XATA. I usually peek ahead in the week (using the fitness planner) to have a general idea of the recommended Focus & workouts
But that’s just how I do it. As always, YMMV  