you can use AI to write code, but you still have to check behind it.

And this is, in large part, why AI is an unprofitable, useless product. So much of the promised productivity is crap, because if you have to validate and test anyway, it takes less time in the end to do the work yourself. If you're building a tech product, you also need to understand how it works because you need to be able to service it properly, and frequent AI use dulls that ability too.

Every single person who uses AI, by now, has seen it hallucinate bug out often enough that it's demonstrably not something which produces trustworthy output.