> I choose to build from scratch in a network isolated environment. As a result google repos are some of the few that I can count on to be fairly easy to get up and running.

If you are building a single google project they are easy to get up and running. If you are building your own project on top of theirs things get difficult. those library issues will get you.

I don't know about OP, but we have our own in house package manager. If Conan was ready a couple years sooner we would have used that instead.