But you have to implement GPT with its mixed-endian UUID's (standard-nonconformance copied from Win 3.1), link the kernel into a windows executable (Which is hacked on top of a MS-DOS MZ .exe) and write that to the ESP, which is a floppy file system from the 80ies. And of course its relying on the VFAT extensions from windows 95.
I don't know how Microsoft managed to design a boot scheme that is conceptually better than boot sector booting while including a similar painful amount of legacy in it.
And then there are the people who celebrate that 'advance' of modern software while their kernel now has a 16-bit real mode "This program cannot be run in DOS mode" stub.