I've not seen much issue from UEFI beyond mobo manufacturers occasionally releasing really buggy firmware. UEFI also permits rather advanced features. For exam

I've not seen much issue from UEFI beyond mobo manufacturers occasionally releasing really buggy firmware. UEFI also permits rather advanced features. For example, if a mobo manufacvtorer wanted to, they could theoretically code in support for using a USB monitor for the bootup display, enabling firmware access without any video adapter on board at all. One can quite easily add new boot-loaders to the EFI system partition, and add the entries to NVRAM, making it possible to add add custom pre-boot diagnostics programs, or a small direct-boot emergency recovery kernel, or other fancy features.