People cheer UEFI failures because Microsoft's actions with Secure Boot and such could align with an effort to eventually completely lock out the ability to install other operating systems on bare metal on hardware you own and don't rent from Microsoft. Microsoft isn't making OEMs only install their own platform keys now, but there's nothing guaranteeing the future will be the same, especially since they can claim to support Linux on Windows through WSL.

Also the whole scheme is not better than making boot configuration read only with a hardware switch, or storing your bootloader and /boot on a read-only medium, assuming you are using full-disk encryption.