HDR10, Active HDR, Dolby Vision and other HDR schemes

[FilmFreakosaurus]

And yet, besides dynamic HDR, Dolby Vision has 12 bit depth and higher chroma sampling than HDR10 (and maybe HDR10+), which seems to be one of the more forward thinking approaches so far as long as the studios follow the correct encoding and mastering standards.

Why the BDA didn't just mandate 12 bit, 4:2:2 and higher as a base standard to begin with... Though, Universal would probably still find a way to screw even that up.