Political correctness aside, "main" does sound like a more natural name for the main branch. The term "master" for a branch name always felt a little strange to me. One might ask, "What is master?" The answer usually is, "It is the main branch." The same thing held true for "trunk" in the SVN world, although it made more sense. One might ask, "What is trunk?" It requires a lengthy explanation, "It is the main develop…
Sure, but who says that what is now called "master" is the main branch?
In my repos, I consider the main branch to be the branch I spend most of my time working on. For simple things that is "master", but for more complex things I'm mostly on some other branch.