It is very powerful, but it is painfully obvious that no one has ever gone back and said, “but what if anyone else who wants to use this is not a Linux cli guru and already has an expert understanding of git commands?”.

This x100. I mean I think I know the answer - Git was written by a C kernel guy, and the devs that it attracted are C guys. The kind of people who think user friendliness is a weakness. Guess how you contribute a patch to Git? Well step 1 is reading a 10 page essay... Needless to say that isn't going to attract many people that care about beginners.