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[nicholfd]

Yes, MK firmware only works with MakeMKV and Xreveal for UHD discs.

Right, so why the difference? Are these drives designed for different use-cases, operating systems, or something, or is the difference arbitrary?

MakeMKV, forums & alternative firmware (for same drive) are for backing up/ripping discs. Different software may use different methods/firmware for managing DRM/encryption, and require different firmware.