Note that I was specifically talking about branch names in Git, where it's debatable if the default name "master" even originated from the master/slave nomenclature.
The problematic nature of the term is a lot more evident in other contexts where a counterpart of the "master" is in fact called a "slave". Whether that's reason enough to change the names in any particular instance is not something I'll comment on.
Lamarckian eugenics!