This leads into the realm of TR taking in more info from various sources. Those could include manual entries of things like RPE, nutrition, etc. It also could include things like data from HRV apps/devices, sleep devices, and so on.
It all bends towards the potential that TR has hinted at (recently on the cast) but also others here on the forum (some level of automated adjustments to plans, workouts, etc). There are MANY variables that make the potential for adjustments to individuals and their current status are far from easy.
Every rule or guideline has it’s exceptions, and the “it depends” statement is a necessary qualifier. We’d all love something automatic to “know” we are getting the most from our training. But the more we learn, the more we seem to understand that self reflection is a necessary function.
We need to try, fail/succeed and learn from each and every moment in our training. Only by taking those steps can we really learn what WE need and how best to make adjustments. I am all for adding in tools if we can gain actionable info from them, but we must recognize that the ideal is far from a potential reality, at least in the near term.