Greetings,
Agree with many here - it depends on the opponent's objectivity and willingness to help both improve (regardless of rating difference).
More often, you get the opponent (having won) who claims they could win this way or that, or - if you won or drew - they claim they *could* have won this way or that!
Sometimes, you get opponents who are willing to help both of you learn - during the game!
Years ago, I played someone with whom I was evenly matched - we both reached a dynamically-tense position where a central pawn advance (d- or e-pawn) by either would either result in opening up the position or lock it up with play switching to opposite wings - both of us hesitated to do so, each wishing the other to commit themselves first.
My opponent had left the board whilst I ruminated over whether to commit myself and which central pawn to advance - I couldn't decide and then thought I'd have a look at it from his side of the board. So I got up, went round to his side of the board - the tables were separated rather than in a continuous line - and looked at the position whilst standing. After a while, I heard a voice say, "Well, can you tell me what's happening?" - my opponent had returned - and we stood there chatting about the position for some time before deciding that we still didn't know who stood better if any pawn was advanced! (A few moves later, he committed himself with his d-pawn, at which point I immediately advanced my e-pawn, locking the position - later, he broke through on the queen-side and I eventually lost under time pressure.)
We did a post-mortem later - and still couldn't decide.
Kindest regards,
Dragan Glas