I’ve always taken issue with this “master” v. “main” argument.
People think it’s “master” as in “master/slave”, but forked branches are not “slaves”.
Instead, it’s “master” as in “master/proxy”. The forked branches are altered copies of an original. We have remastered movies, music and games, and I’ve never seen anyone complain about the word in this context. Why should version control systems be any different?
They would be willing to reopen it if people show up to develop it. The problem is that seemingly noone is invested enough to keep it going.