Git is simpler than any other VCS, but VCS itself is not simple concept to understand. That's what he's saying, and I agree. I use git all the time, but it's not easy to understand the whole version control thing as a beginner. Also Git is not just about DAG, you need to be able to understand the decentralized nature, etc. In that sense, some people may find SVN easier to understand.
Exactly what I meant. If you're working with people who need to learn what a DAG is in the first place, that adds some overhead. After that you still need to understand that your working directory is just a scratchpad, and branches aren't actually like real-life tree branches but instead they're pointers to the ends of those real-life branches, etc. Not exactly simple.
Conceptually speaking, a centralized VCS -- one where you check out files, make changes, and check files back in when you're done -- is vastly simpler than Git. Sure, it's also much less powerful (and I would choose Git a million times over such a system), but it's definitely simpler.
