Are y'all overengineering or am I not unlocking claude's full potential

I see a lot of threads talking about rich skill repositories, good prompts, claude.md optimizing and wonder, is this necessary? Just saw one where op asked how others set up their review prompts. When I started using claude, I wrote lenghty prompts starting with stuff like "Assume the role of a senior software architect.... be brutally honest and challenge my assumptions... be explicit about assumptions yadayadayada", but that quickly felt like a waste of time. I now just plainly tell claude a) what I want