This seems like a real coarse and not particularly accurate binary, but even if it were true, the thing about Claude Code and agentic coding like this is the cost of making a mistake or the cost of not being happy with a design and having to back it out is getting smaller and smaller.

I would argue that rapidly iterating reveals more about the problem, even for the most thoughtful of us. It's not like you check your own reasoning at the door when you just dive head first into something.