That last part about it acting like a junior matches my experience very well. I'm using LLM's for refactoring, adding repetitive blocks of code, etc.

Unless I'm very clear at all times it will write code like the most annoying stubborn junior you've ever worked with. Nothing is sacred, everything can be abbreviated, shortened, made more confusing, made less readable, and concepts like readability or naming conventions are not even considered.

It also adds superfluous nonsense comments that don't explain the "why".