Names are a funny thing. When gay marriage was still disputed I argued for just dropping the word "marriage" from law. My country has had civil partnerships available to all since 2000, which is gay marriage in everything but name. A decade later and people were still fighting for the name. I don't get it but language is a powerful thing and means a lot to some people.
As for master->main, that was just fake activism by people desperately wanting to be a part of something but not prepared to put in any actual work to convince anyone of anything they don't already agree with. Convincing people to drop the name JavaScript would be difficult due to the attachment and perceived loss to an evil company.
I've discovered submodules and build pipelines broken due to a changed name within the last year. Doesn't help that some people are late to the party and still changing things now. But, hey, at least I've done my part against slavery /s
Why we do not just use EcmaScript from now on in conversations and as a trend so the issue is solved. A joke to me.