Comment by OkayPhysicist

In more than one team I've been on over the years, I was the only person with a deep understanding of Git. What I've found as a result of being the "oh shit git" guy is that

1) all UIs are completely missing at least some of Git CLI's functionality (shoutout to git's most neglected feature, git notes)

2) all UIs have at least a couple git features so tucked away that you'll only find them if you know to look for them (git checkout -- path > temp_file is a common culprit here, but I've seen UIs that hide git ammend)

3) the average time for a UI-exclusive user to need my help for one of those two reasons was about a month.