I think they left off an important reason, which is that if an engineer is spending most of their time working on Go, and Go's written in C, then they're making

I think they left off an important reason, which is that if an engineer is spending most of their time working on Go, and Go's written in C, then they're making decisions about Go without actually spending a lot of time writing Go programs. Better if the people driving Go are spending all day writing Go programs.