If you think AI can replace experienced engineers you're not working on anything complicated. If your product is a web app, sure, maybe. If you're working on actually difficult problems, then people who know what they're doing are irreplaceable. AI can supplement them and make them more productive, sure. AI does not know what NOT to build.
Fwiw the guy you're replying to is trying to replicate 1:1 the entire Adobe creative suite (and now Microsoft Office?) with the help of AI.
> ackchually difficult problems
That's likes rocket science, av, automata and things like that.
Less than 1% engineers work on that and even they are using ai.
For other 99%, one person knowing what to build is enough.