users being warned multiple times that it's vital to review anything before you install it, compared to the official repositories.
I think this stance should be re-evaluated. Arch Linux developers are doing a fantastic job and I am personally thankful to them - this is not in any way critical of them. And while I don't see an easy solution here, I just feel that the time of "warning users" is long gone with how much supply-chain attacks are ramping up these days.
Some other controls could at least alleviate the problem. Perhaps some form of peer-review and grace period before publishing could help here?