I can’t remember the details anymore, but for a year or two I had a bad run of absolutely hosing my boot config and leaving myself in a state where the system either couldn’t find it’s kernel or couldn’t find the root partition and would drop me into an initramfs emergency shell. I got pretty good at booting into a live environment, getting all my dm-raid and lvm disks discovered, mounting all the relevant file systems in the right place, chrooting in and rebuilding the pieces that were broken