“I do feel though, that they incapable of deriving what the correct halacha is, since they never learnt it in depth.”
Since when is the idea for bochrim to be able to posken for themselves?
“if they learnt differently, there would be a different flaw. (like they couldn’t learn in depth)”
I don’t believe the OP was talking about learning in depth as in learning a ton of different meforshim on a sugya. He was speaking of the learning style in American yeshivos where they read half a sentence and sit around all day squeezing their brains to figure out where its going instead of just reading the rest to get the full context. I personally do not believe this is a productive use of time.