Is there any point in having separate tags efi and uefi? EFI and UEFI are different versions of the same standard. Most if not all questions are about 2.x (“UEFI”) versions, not about the 1.x “EFI” versions, so we should either clean up efi to be only about the actual EFI versions or merge it into uefi.
Merging makes sense for the most part, the only significant user visible difference that has made itself felt is secure boot, which is only available in uefi. If you turn off secure boot the typical user will not be able to tell the difference. The real differences between versions would be visible to developers so I would recommend against merging them on stackoverflow (unless there was significant confusion) and for merging here unless there is general disgust with secure boot amongst the efi folks, even so anyone who knows efi will know how to deal with that.