The colors specified in ITU 2020 are at the outside edge of the CIE diagram. Any point along the outside edge of the CIE diagram is a single wavelength. It effectively means in order to get out there the bandwidth of each color is going to be extremely narrow.

And this means that color filters on microlenses must be same narrow ones (if you want to capture such true colors).
And this means that sensitivity of cameras will drop dramatically.

So, big part of so called "color science" now is to have wide color filters (wider than even for Rec 709) for sensitivity and try to push colors using math.

With display it is all in reverse. You need laser light sources or special QDOT backlight, and it will be hard to keep same brightness, let alone HDR.