The point is that the word master, in this context, has a different etymology that the word master in say, a database. Now, that might not matter: if you care about changing the name of the branch you probably care about the way the name makes people feel, not the etymology of the word, and perhaps that's a good argument (personally I don't know and don't really care). Nonetheless, the etymology of the word is a factual statement, so I was correcting a poster who was assuming it was an analogy to a different context.