How many computers are you operating though? Maybe you'll have to reboot a couple times until you figure out the proper key but then you'll know it. And if you forget it, you clearly aren't doing this often enough for it to be a problem either
It really depends on users. Personally... ~100? Servers, clients, dual-boot configurations, lost machines with PXE boot, various brands and BIOS versions, some even still boot in legacy mode because their UEFI support is bad (like PXE boot doesn't work as well as it should, and as well as it does in "BIOS" mode). So having GRUB on basically all these machines, I'm very happy.
If I could do the same with something that is as small in terms of footprint, and is as flexible as GRUB is (we also PXE-boot into GRUB loaded from the network, both in BIOS and UEFI mode), then I'm interested.
