I don't use X11, but I've had a very negative experience trying to contribute back to MIT/BSD/etc licensed projects anyway, as they're usually just one close te

I don't use X11, but I've had a very negative experience trying to contribute back to MIT/BSD/etc licensed projects anyway, as they're usually just one close team of developers publishing something and rejecting any outside PRs or requests. License choice is a political choice, and it's not a coincidence that corporate-friendly licenses are usually on projects that have a strict vision and reject outside changes. I've got the features I want, in the way that I want them. If you want to use them, you're free to switch — for some of my projects, tenthousands of people have done so.