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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
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They’ve been working to do just that with the checkboxes, but it’s still kind of half-assed and if you want a full normal experience you’re better off just enabling RPMfusion the normal way.
Re:MATE, I’m actually not sure why the changes haven’t been pushed upstream as the Ubuntu MATE developers have a ton of overlap with the core MATE team. I do know there have been efforts by the Ubuntu MATE devs to nudge other distributions to adopt relevant packages like the Ayatana indicators which were made for Unity and now are used in Ubuntu MATE which have gone ignored.
Regardless, for the end user who prefers MATE, the choice is kinda obvious.