Sure reviewing changes is easy. But the problem is that it is still a review. You need to have an understanding of what exactly is being done and to account for any oddities that may or may not be because of the quirks of upstream. That’s why I mentioned that AUR trust models should be made like pacman for most helper. We trust the maintainer of Arch so why can’t we trust other people too? Take PPA, the trust model is exactly that. You trust the maintainer. At the very least make it an option that you can choose on first run