I actually understand the concern with RPE. Not all lifters, specially the younger ones, do good training decisions all the time. But on the other hand its a good learning experience.
With the other benefits of autoregulative training, this is actually thing I like in RPE, PR blocks in 5/3/1, max. effort days in conjugate etc... They also underline the important fact that besides the program you're doing, the more important is the execution of that program. As we all know - training is highly empirical, and kind of skill-like activity. You'll learn best by doing stuff. RPE and other such things force people do decisions, which is imperative in training (if you don't have coaches to make decisions for you).