Unlike the 'master'/'maintainer' role, the main branch does not directly correspond to a person.

A master/slave DB isn't a person either and look where that ended up.

Which no doubt comes from the term "master copy", which has a long established, and quite precise meaning. Choosing a different meaning arbitrarily(or actually, quite deliberately) is disingenuous at best.

Hg sensibly calls the default branch `default`.

Git sensibly calls the master branch `master`.

That's funny, because it's pretty common to set a 'dev' branch to default and reserve the master branch for production code.

We won't change that until git does. Of course you can customize your default branch.

Where is the slave

Try "main"