Bluskis, sorry to become abstruse in my attempt to produce unambiguity!
Yes, I agree with you and Westwind1950 in the essence of such a scheme. Almost exactly as you describe, though I think there could be a strong element of one to one discussion with a mentor both prior to and after a flight. (I.e. an informal briefing and debriefing discussion.) The idea of it which I have at present is that:
i) a club's or a school's CFI would attempt to match new PPL holders with amenable experienced PPL holders. E.g. would attempt not to match a relatively unassertive individual with someone with an over-confident manner, for that could lead to a diminution of confidence in the new PPL holder.
ii) the mentoring process is a one to one relationship, so that matters can be raised in discussion (after each party had achieved some confidence in the other) which the new PPL holder may feel diffident about broaching in public.
Of course, to fly together is extremely valuable, and is to be encouraged. Ante- and post-flight discussion, though, is, to my mind, also valuable in that issues may be raised independent of the pressure of aviating.
The mentor, also, would need to be alert to issues which require the expert help of an instructor, and encourage the new PPL holder to seek that help.
I do not propose such a scheme as a panacea for all problems, nor do I suggest it should be compulsory. It is merely offered as an idea which may assist new PPL holders to continue the learning process, and which some clubs and schools may find useful to adopt.