This is essentially what the [extra] repository is. Not using the AUR and sticking to official Arch Linux packages exclusively is a very valid and reasonable choice (that I follow myself actually).

A large number of "an Arch Linux update broke my system" is very likely due to incorrect AUR use that AUR helpers don't handle for you. There's an elaborate writeup here from just 2 months ago: https://lists.archlinux.org/archives/list/arch-dev-public@li...

Unless things have changed in recent times, packages in [extra] are maintained by TUs. Random users can't submit packages.