I am yet to see this mysterious phenomenon of AI working so much faster and better than high performing teams. What I see so far, is sloppy code, poor tests and systems that do not scale in the long room.

Yeah, hence the "when/if". Still a few model generations off, IMO. But if it happens, I think "serialization of feature development" is going to have an outsized effect on architecture, process, planning, deployment, etc.