"The beauty of the AUR is that you stop waiting for developers to ‘support’ your OS. If the community wants it to work, it works. Period."

I take issue with this statement. The AUR can be very useful, but the packages in it are maintained by volunteers, so the onus ultimately falls on those volunteers to make sure those packages keep functioning. It's not uncommon for packages to fall out of date with upstream, and sometimes packages even end up being abandoned.

Arch is a fast-moving system, so packages for it need to be actively maintained to remain installable and functional. Flatpak packages are often volunteer efforts as well, but Flatpak at least allows packages to use specific versions of different libraries so that they can keep functioning.