enabling HDR hasn't so heavy requirements at all most of the HDR requirements are rather on a higher level like when to enable HDR and when not if detected that it is HDR content, it's more the clean management of it inside the Device architecture.
Hollywood has higher requirements hence they want foremost artistic control of it to manipulate it to their liking to get certain emotional feedback from the viewer from it.
That's also why it was rather Simple for Samsung to adapt their Tizen Software/Hardware stack to support it fast for VP9, the most complex thing in HDR is how efficient it works together with the PQ and how clean it is percepted in the end from the output Device and the acquisition of it
