Sure, and using the AUR is something to pay attention to when you do. You are right on that^1^.
But, here is the thing: I just don't have to update anything if I don't want to. There is no Windows Update saying "next reboot we're going to update and you don't get a choice". That is what I meant when I said that I just don't worry about it.
Though I guess that says more about what one gets used to when dealing with Windows, than necessarily being high praise for Linux. My work machine has been having issues with a bt headset for reasons I cannot phantom despite working for years, so forgive me if the joy of being able to leave well enough alone has got me excited.
^1^ I would argue that updating in general has become more fraught with danger, so I don't really see the AUR as particularly dangerous in comparison, but my tolerance for danger may just be out of whack. See Notepad++ vulnerable versions, or just npm in general, for non-Linux cases.