Yay. Now we have an OS hard-coded into the BIOS. Why is this a good thing? What does this buy over simply putting a flash chip on the motherboard and letting t

Yay. Now we have an OS hard-coded into the BIOS. Why is this a good thing? What does this buy over simply putting a flash chip on the motherboard and letting the OS treat it like another peripheral, perhaps with a pre-installed slimmed linux distro?