Not working on the “next big” thing but I only recently started finding that AI could solve complex problems for me starting around ChatGPT 5.5. Working on a game engine. Some of the quite isolated modules I’ve had it build are not good code by my own standards. The code has way too many indirections to say the least. But they work without bugs and perform well too (i have a very good CPU and memory management harness for my frame loop). My velocity on the project has doubled at least cause now stuff that I wanted to do down the line is already done. I’m definitely a bit careful with setting up isolated guardlines about which files I let a certain feature touch but with models like Fable even found that unnecessary.
Working code that performs exactly how I want on an outer level is valuable. It can be refactored and rearchitected or reimplemented better by just the virtue of having something to compare against and having the edge cases accounted for.