Did you miss a required manual intervention on an update? A while ago there was an arch update that needed manual intervention cause of a dependency circle. Might be worth looking up the past year or so of manual intervention newsletter posts for Arch.
Last time I had a dependacy issue I was able to remove the conflicting package, update, then reinstall the package and it worked fine afterwards.
My own system was working great for a long while on an Arch flavour. But a bit ago HDR stopped working properly after an update and I just couldn’t get it running right. Would display very dim.
Eventually gave up on my 2 year old install and went back to Tumbleweed.
I loved all the tinkering on Arch, but I just don’t have it in me to do the tinkering anymore.
I don’t miss AUR. Well, I do but opensuse has OBS. Technically OBS is better as packages can be rebuilt automatically when dependencies are updated, but there are a lot more users on the AUR than OBS so AUR has more stuff on it.
OBS packages are less likely to break your system in an update, but the AUR is just flat out bigger.
There hasn’t been anything I’ve needed that I haven’t been able to find either on OBS or as a flatpak. When something isn’t in the disro repos, I look for a flatpak first, then check OBS. Mostly cause flatpaks are easier to search.