One can only hope that cinematographers do the sanity check regarding HDR technology. Were it for manufacturers and technology developers we have to have 10,000 nits (full screen) 16k TVs.
Watching this podcast, there were so many things I wanted to make a footnote about; I will choose just two because they are some of the biggest misconceptions about HDR:
1) Those so-called HDR images where there is a full tonal range indoor-scene and a window where you can see the outside landscape and not a burned-out area are not dependent on HDR monitors, they are produced by HDR __CAMERAS__ (or techniques). HDR cameras allow to have a capture where the burned-out area, even if it looks burned out --you have already exposed for diffuse white (Zone X) inside the room so the outside scene is then brighter and burns out-- STILL can be graded/tone-mapped to a regular tone-range because the numbers are there, the color/light values are not clipped even if the image looks so. If you do the grading (to you artistic vision's desire) the image can be displayed in a regular monitor, you don't need a HDR monitor to display it.
2) HDR does not affect the black level limit of a monitor; that is dependent on the TV technology (and the room).
This paper is the most sensible thing I have read about HDR:
UHDTV - HDR, HLG and WCG
A few more items:
What finally, finally was said (kudos to the guest) is that if the reference level is kept at 100 nits for diffuse white (the standard) then a, say, 800 nits peak display would have a range of 3 stops to show highlights beyond diffuse white (Zone X), which should be enough for "normal" cinematographers. That capability would be needed just in small areas (highlights).
It is quite a stretch to say that it is important that people that watch TV in a bright room should enjoy the same reference dynamic range, so 10,000 nits is a necessity: to mention one factor, some blacks will look gray no matter what because of reflections. Another stretch is to say that the same people would notice or care about faint color tints in highlights.
It is impossible to do HDR with film: Diffuse white is the lowest density film can have (clear film), and it is in the regular tone range (Zone 0-Zone X). No way to do additional zones.
Manufacturers took two important improvements, more bits and better highlights, and turned them into a mon$ter.