Many people are used to having a standard keyboard and a monitor attached to their computer system, a console. Because VGA BIOSes often rely heavily on legacy BIOS services (sorry, should've mentioned this part yesterday) these VGA BIOSes cannot be utilized in LinuxBIOS (yet) because LinuxBIOS doesn't provide these legacy BIOS services (interrupt services, int 15h etc. Search Ralph Brown's interrupt.lst for the keyword BIOS. :) yet. There is work underway to add needed parts from the Bochs project's GPL legacy BIOS to LinuxBIOS, which would also allow all VGA BIOSes to work.
It is been already done.
linuxbios supports both standard pc bios services as well as vga bios (although vga bios is in the binary only form so far).