Go is about productivity. It allows writing, extending and maintaining big codebases with lower efforts comparing to assembly or some other programming language out there. This is because of simple "what you read is what you get" syntax without implicit code execution. Generics break this feature :(

Of course, there are other brilliant features in Go ecosystem, which simplify writing and maintaining non-trivial codebases in Go - tooling, standard library, fast compile times, statically linked binaries, etc.