Why don't we just ask AI to write assembler?

Programming languages, frameworks etc are just there for developer ergonomics, code reuse and human understanding.

If we generate so much code using AI that no one is really looking or reading the code anymore, just verifying end functionality, we can really just skip all that and go straight to assembler, no?

Sure, we could reuse some basic building blocks like implementations of the tcp/ip protocol, http, sockets etc but server frameworks like fastapi are just human friendly abstractions over all that.