But it's not a limited amount of concepts. One sphere in a vacuum is easy, three spheres is hard. Git has half a dozen subtle interacting data structures. But b

But it's not a limited amount of concepts. One sphere in a vacuum is easy, three spheres is hard. Git has half a dozen subtle interacting data structures. But because people have built up a lot of experience working with them (and don't coach beginners and non-programmers) they shout "it's just an ADG, so simple!" and pretend like everything is fine...