Is the takeaway here, then, to beat third parties to the punch when creating a new technology and include a first-party easy-to-use interface right out of the gate?
But no, you can't demand it as some kind of mandatory component for a project to "count as a real FOSS project".
And for git, especially... It's not as if an easy-to-use interface had ever been a priority there. ;-) What one could ask for from them, though, IMO, would be a website of their own where they at least explain what it is. Because if such a thing exists, I must have missed it. I mean, git-scm.whatever isn't that, is it? That feels more like... Idunno, it's actually Atlassian in a thin disguise, isn't it?