Git is sort of a baselevel of sanity these days. It's not perfect but it sort of integrates with all important build tools, everybody can work with it, and it does what it needs to do. There are a few similar version management tools out there that you might legitimately argue are good alternatives but stuff like svn, perforce, and cvs are not what I would consider a sane or even defendable choices at this point.
It's very simple: either you care about version management and you use something decent or you don't and you might as well use something decent. There are very few technical reasons to stick with legacy version management technology beyond "we can't be bothered to give a shit".
Usually when you encounter those, the organizations that use them tend to have loads of other issues that all revolve around having a lot of technical debt; usually fueled by years of mismanagement.
Not the most attractive work place in other words.