So much this! As a user of both Arch and Gentoo I say, don't use Arch as Gentoo! It's not Gentoo! AUR is not a standard repository and there's a reason they make you jump through hoops just to use the thing.
Also, it's a total pain when normal package management is quick and easy. The building alone is weird in Arch and somehow like 60% of the crap I try to build from AUR fails hard and I just can't be bothered to spend more than like twenty minutes tweaking on it. Gr. 😅
(Aaalllsooo, apparently lots of people break their Arch installs using the AUR like it's a normal repo and then wonder why Arch is so crap and leave.)