Rationale for HDR10+ and Dolby Vision ?

[kfbkfb]

Human eye information:
https://www.lightillusion.com/uhdtv.html

...the human eye's huge Dynamic Range, which has a
dynamic contrast ratio of around 1,000,000:1...

...the human eye's static dynamic range,
many agree it is around 10,000:1...


The human eye can't adjust the static dynamic range
within the dynamic contrast range in 1/60 second
(the time for 1 video frame), so exceeding 10,000:1
(with HDR10+ or Dolby Vision) doesn't seem to serve
a purpose.

Why bother with HDR10+ and Dolby Vision, just use
regular HDR10 and dynamically adjust the picture
contrast/brightness (and related factors) on the
Original Master Video as needed, that way every
viewer (on a calibrated HDR TV) sees the desired
picture quality.

Kirk Bayne