Git itself isn’t decentralized is about people copying it and sometimes mirroring it.
Not sure what you mean. My understanding is that git itself is decentralized insofar as each clone can develop its own history without ever needing to push to the origin, but that what OP is referring to is actually the “distributed” nature of git, where i.e. it’s easy to copy the entire history of an instance.
What version control software in particular do you find better than git?
Your point about users often managing git projects via centralization is taken and valid. I was just pointing out that you don’t have to use git that way - different clones can separately develop their own features - so the earlier claim someone made that “git isn’t decentralized” is still wrong, imo.