There are reasons by PCs run with a Bios - and UEFI is approximately as bad as an idea as the Kickstart was, even though it is much less complex. Look at all the UEFI bugs that were discovered in the last years, including some bugs that could brick your entire system...
I don't agree that kickstart is a particularly bad idea. If you had a flash chip instead of a rom, like every PC available today, then it would solve most of the issues.