You're going to be waiting for a while.

Even Fable is bad at this, I would constantly have to fix it going down architectural dead ends or just making obvious mistakes.

Which sucks for people that want LLMs to do everything like a genie, but does mean senior engineers have a few more years before they become redundant.

This is a harness problem not a model problem, try prime agent it can do that and it will do it well even :P but you need to prompt it in according to its tools and processes.