In general, if someone wants to beef up the tooling in my project that I know is fine to begin with, I still say "I don't mind, go ahead, but I will continue using my old tooling until yours works with no regression." Half the time, they abandon it. I don't even know how Bazel works cause I've never felt enough pain with makefiles etc to research an alternative.

Also, Google tooling knowledge doesn't transfer very well to outside projects. Everything is special on the inside there. They use an internal version of Bazel called Blaze that's totally integrated with everything, with entire teams dedicated to the tooling, and only a few officially supported programming languages, so of course it works smoothly.