AUR however, is untrusted (or rather shouldn’t be trusted), often out of date

So basically like a PPA which are used by many users of Ubuntu. The only difference is that the PKBUILD files used to build the packages are easier to check than the final packages in a PPA. And that’s exactly what is a big advantage for me.

sometimes requires compilation,

This is often because a project does not offer ready-made packages that can be downloaded from Github, for example. There are also people who do not trust ready-made packages from unknown third parties. I wouldn’t necessarily download and execute a binary file from a Dropbox of a user I don’t know. Compiling is the safer way if the source code is downloaded from a more trustworthy source.

and doesn’t even have any good pacman wrappers since yaourt (that I’m aware of).

Personally, I don’t think aurutils, paru and yay are bad. I currently use aurutils myself. But as far as AUR helpers are concerned, everyone has their own preferences. That’s why there are so many ;-)