Comment by ranger207

BIOS was always heavily tied to x86 PCs, as it was a de facto standard in the first place by the fact that it was reverse engineered from the IBM PC. Of course, PC-compatible firmwares were never required for x86 PCs, but it made it convenient in the era when people would bring their own OS. When ARM started becoming popular, it was generally in embedded applications where the manufacturer was going to produce a single firmware to do a single task. It's only lately, since UEFI became the standard on x86-type computers, that anyone's bothered making a general-purpose enough ARM device where you might want to bring your own OS and that UEFI has been something that would be useful there