No disrespect, but asking everyone to remove words from the English language because they may offend a small group of oversensitive people is one of the most frustrating social initiatives of our time. "Master" makes sense for the job and unless we're also putting "Slave" and "Cotton" on the dictionary chopping block, the arguement will always seem arbitrary to me.
The only reason you think "master" makes sense is because you're used to it. It's actually quite a weird connection to make, if you aren't used to it. "Main" is much more straight forward. And nobody is really demanding people stop using "master", so far as I am aware, it's just that people are making that choice themselves.
Yes that is the point. They made the choice to change their default. You can still make the choice to name your branches, especially the main one, as you like. Setting it for a project is less work than complaining about it.