The point is, you will be better than your competitor if you resist it.
From what I have seen AI doesn't understand the code. But even if you argue that it does understand the code it definitely doesn't understand the domain because it's only input channel is a stream of text and you didn't even type in a "full" text representation of the domain.
So you remain the only thing that can understand the whole system. If your competitor has no one (or no team) who can put together a full understanding of the system then you will have an advantage.
For a todo app that is fine. But for most projects your competitor will leave you in the dust with the speed at which they add features.
Same story, 25 years ago:
> But with Lisp our development cycle was so fast that we could sometimes duplicate a new feature within a day or two of a competitor announcing it in a press release. By the time journalists covering the press release got round to calling us, we would have the new feature too.