Yet, the BIOSes both of the last motherboards i bought (one recently, another 3-4 years ago) had some very elaborate UIs, with skinned menus, star backgrounds and a bunch of other frivolous stuff. I think one even had some sort of background ambient sound.
Keeping with tradition though, the "help" screens of every option was as helpful as the "help" screens of my 386DX, Pentium MMX and Athlon64 desktops of decades prior, with entries such as the help for "Select frobation mode: FOO" being oneliners such as "Frobation mode, can be FOO or BARF" (but what the hell does frobation mode do and what do the FOO and BARF options mean?).
I think I still have somewhere a pile of paper booklets that came with old motherboards that have similarly unhelpful descriptions of various settings.
I always thought "This is really neat... not sure it was worth the effort for a BIOS..."
Granted in those days users were more likely to be in the BIOS to do something than today.