Go support is awesome, IMO. Personally I have favored Bazel over “go build” for a while, except for pure Go projects with no generated sources.
Gazelle is wonderful and it doesn’t belong in Bazel core. Bazel is a build system for every language, and Gazelle is for a subset of Go developers. Since it’s not part of Bazel core, you can always replace it with something else.
I recommend Gazelle for importing third-party Go dependencies but not for your own Go code. If you are using Bazel, just write the BUILD.bazel file yourself with the appropriate go_library / go_binary / go_test rules.