I think "leveraged this coding methodology" is an unjustifiably positive way to describe the results of the process. I think "spread this disease" would be more accurate. UTF-16 strings, really? VFAT? PE32+ is maybe justifiable (I'd prefer ELF, but that's because it's more familiar, not because it's actually better), but VFAT? And even in 01998 it should have been apparent that UTF-16 was not a sane format for strings, much less in 02005 when the EFI → UEFI transition happened.

To me, UEFI is like "leveraging the waste disposal methodology" of dumping your toxic waste in a lake. Yes, it's more convenient for you, but it does lasting damage and causes years of suffering for millions of people; and eventually somebody else has to clean up your mess, at far greater cost than if you'd just done something sensible to begin with.

I could probably say the same thing about X-Windows.