In 2008, more x86-64 systems adopted UEFI. While many of these systems still allow booting only the BIOS-based OSes via the Compatibility Support Module (CSM) (thus not appearing to the user to be UEFI-based)
In October 2017, Intel announced that it would remove legacy PC BIOS support from all its products by 2020, in favor of UEFI Class 3.[118] By 2019, all computers based on Intel platforms no longer have legacy PC BIOS support.
so it took quote some years to fully get rid of it
@eloy yeah but yeah i mentioned it like twice already but i really wonder if the reason why lga 775 boards were wonky with settings was that they were pretty much the testing grounds of uefi