You're right. But there's a lot of broken software out there that just trudges on with momentum.

That said, I'm pretty sure you can just make a main branch and delete master in your personal repos. I don't think git itself needs master, does it?

There's a lot of 'broken' software that assumed any Windows version number with a 9 in it was made in the 90s. That doesn't mean that we can (nor should) throw out that software.