I often feel like one can't learn from their interactions with girls due to the unlimited (and unknown!) variables

Someone could bang a girl and be like 'Ahh.....I was being very cocky in that interaction. That's the secret', but the truth is that he was just her physical type, and no matter what he'd have done, it would likely have worked.

He could then be 'cocky' with the next girl (who thinks he's a bit old and short for her) and thus get rejected, and he'l tell himself, ''Ahhh....maybe it was my approach angle or I didn't ask good enough questions?'' when the truth is he never stood a shot.

Maybe he'll think back to his successful interaction and now decide 'Ok, it wasn't the cocky thing because the 2nd girl rejected me. Maybe it was because I didn't ask her her name in the first interaction? I remember smiling alot, too. Maybe that was it? I need to smile more??'' etc etc

See what I mean? People could spin their wheels for eternity