Apple was using the precursor to UEFI (EFI) back when most windows boxes were still booting using BIOS derived from a rip off of a 1980s IBM.

It's because 95% of people do not care or don't like playing around with their computers or accessing the UEFI menu for sys-admin, netbooting, recovery, ransomware development or building their PCs.

Apple does the same thing without the spooky UEFI menus on PCs, called 'Internet Recovery' which is still using EFI and is just like how netbooting works; and that 'just works'.

The filevault unlock screen interestingly enough is an EFI application, carefully constructed to look like the normal login screen. It's probably the most used EFI app that normal users interact with.