And how do you propose to overcome this problem? Simply loading it in the kernel isn't enough to make it work. Once an OS loads, the environment's not right anymore. Which is unfortunate since I think that's the only way you'd get linux to do what you want -- use UEFI devices exclusively so you don't have to use your own drivers and in doing so alter the machine's environment. DOS is an extremely simple operating system. It doesn't have or need device drivers for basic functionality and it doesn't modify the system environment much at all. It relies on BIOS calls(i.e. firmware code) almost exclusively instead.

The original IBM PC BIOS calls were rather limited in function though, so raw DOS doesn't get you anything but disk+console+keyboard, and it's performance is poor compared to what real device drivers could do.

A DOS-like thing that fully utilized UEFI firmware capabilities could have much more features than DOS did. It wouldn't be anything like Linux but might be useful since you could still run many tools in it. You could check out LILO or GRUB to see how they use UEFI.