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Using a live image for the once-in-a-decade event that a kernel doesn't boot properly isn't a huge hassle.

> fancy pants filesystems that support snapshots simplify this situation.

This is what I used. zfsbootmenu is an EFI executable with support for doing zfs rollbacks (and any other arbitrary zfs command) so as long as my EFI partition is left untouched, I don't need a livecd or another partition or anything.

> did some research

Maybe just didn’t want to boot on faulty kernel at all, now that the risk of permanently damaging the display was known.

well, It's my laptop and Iw as playing with endeavouros on it so it didn't have any fallback kernels. choosing grub options isn't really a brains operation for most of us, we stick with defaults.