(It's a bit vulnerable to it on first install, but so is 'just navigate to the project website [and click download]'.)
Git repo have been attacked other times in the past, but a 500/1000 stars project still sounds more trustworthy than a user repository managed by randos with a couple of upvotes. I still use the aur for simple cases, but when I see aur packages depending on multiple other aur packages I immediately leave.
After using Void Linux I switched to `aurutils` to get a similar separation on Arch. I can easily maintain a local AUR repo by compiling/making my own binaries and can use `pacman` to install and manage them which improves the upgrade process overall.
Perfect demonstration!
The pacman wrappers you mention are crazy, though.
Also if the software is downloaded in the form of a git repo, you only needed to checkout the new tag and rebuild, don't need your browser at all.
Of course the process breaks down for a large amount of packets, but I've never been in that situation. In part because the official repo is already large, and in part because I like minimalism.
If that even became an issue, I would manage a personal set of pkgbuild probably.