While that may be true, you can be confident that it works in a way you personally understand. Because you understood it in the past.

Also, if you finish your work on a module with care - you return to a module you can trust with clear boundraries and known flaws. This is not true of AI output.

No. You can absolutely build things with AI small or large and understand it. If you don’t understand it. Then you’re not caring about the output to begin with and not guiding it to build the solution you want.