First time I hear of this, who uses this and why?
"leader/follower" or "primary/replica" are much more neutral terms that won't prompt negative emotions in many people.
People who choose one of the latter two options do so either because they feel it is more accurate, or because they wish to avoid the negative connotations of "master/slave", or a mix of both.
You might not care, but there are a lot of people that do. Taking steps like this improves the comfort level others while affecting yours none. Why is that not worth it?