Yes, Java is orders of magnitude more complex than erlang. What kind of comparison were you trying to make?
Back to the original topic, git is also way more complex than a DVCS needs to be (compare e.g. with monotone, or just about any other DVCS). And any DVCS is way more complex than even the most difficult to use centralized repositories. So I think the OP's point is valid. There is at least corrolation going on here.