In my experience the motivation to use a particular SCM scheme is tooling. That makes some of the choices non-obvious to developers that aren't familiar with th

In my experience the motivation to use a particular SCM scheme is tooling. That makes some of the choices non-obvious to developers that aren't familiar with the tools and their quirks. A lot of people developing those schemes forget to answer "Why do we do this?" because it is so obvious to them and you really should ask that question.