Perhaps, but there are a few that do it, such as photoprisim and photostruct.

As somebody that already has an NFS share for their photos, is immich able to use my already existing photo location, or is it another one of those that requires an import process that copies them to its own storage?

So, what, it only lets you upload pics remotely but not view? I do not understand.

I was thinking of trying it out but the huge banner saying not to trust it for anything important makes me hesitate every time.

It’s only scary if you think the AUR is inherently trustworthy. It’s not, and every piece of official documentation and various wikis make it abundantly clear it’s not. (If you see somewhere that doesn’t point it out or edit it so it does.)

The AUR is barely better than pasting J Random Hacker’s ‘curl http://foo | sudo bash’ code you see somewhere to install something. And that’s only because at least the AUR makes it easier to inspect what’s about to run and what changed.