The "just generate go code automatically then check it in" is a massive miswart from the language, and makes perfect sense because that pathological pattern is central to how google3 works.

A ton of google3 is generated, like output from javascript compilers, protobuf serialization/deserialization code, python/C++ wrappers, etc.

So its an established Google standard, which has tons of help from their CI/CD systems.

For everyone else, keeping checked-in auto-generated code is a continuous toil and maintenance burden. The Google go developers don't see it that way of course, because they are biased due to their google3 experience. Ditto monorepos. Ditto centralized package authorities for even private modules (my least fave feature of Go).