No, I've been running Endeavour forever and know his pain quite well. It's almost always core packages that break it. None of the stuff from the AUR has ever caused issues. That being said he should be using btrfs and taking regular snapshots. Sometimes I feel like installing grub just to make recovering snapshots easier.
Twice this year I've had updates break the system, both were core packages. I just restore a snapshot then delay my next update for a couple days and it's usually fixed.
It's pretty common for me at least, I went from manjaro which broke during an update, to endeavour which broke many times but by that point I clued in to btrfs and it's snapshots. Now I have my home directory split into different hard drives and I just keep my fstab file backed up online in the event that a snapshot can't save me. Which happened last week, rather than continue on with endeavour I tried CachyOS this time. One day I'll install Arch the way it was meant to be, but until then...