Is anyone suggesting you either throw the baby out with the bath water or ditching the approach?
(I’ve not got my finger on the pulse of current opinions on boards as much as before so I might be missing something and article or someone’s comments)
The one thing I would say is that one piece of information assessed in isolation and acted on is far worse than no information and no action!
You can only look at the information in the context from which it was taken.
In a team context you can’t get the chance to ask everyone how they felt post session - hence an RPE might be useful.
Of course if you only train one or two people I would argue against it’s benefit.