Not that hard to use git as a replacement for RCS. A few extra commands (not going to quibble over the fact that RCS requires checkout before edit), but that's about it. The one thing I can see going for RCS is its granularity (in only tracking single files), but that can be as much a burden as managing whole git repos, ie it depends on the use case.
$ $EDITOR somefile
$ [git add somefile && git commit|ci -u somefile]
Not that hard to use git as a replacement for RCS. A few extra commands (not going to quibble over the fact that RCS requires checkout before edit), but that's about it. The one thing I can see going for RCS is its granularity (in only tracking single files), but that can be as much a burden as managing whole git repos, ie it depends on the use case.