Because "hey, turn down your brightness a little, dude" is not a product you can sell for money.
If anything, I think this screen should have the option of collecting ambient light from an even larger area.
It's actually somewhat genius. It's also interesting with color temperature. I guess it's a CRI of 100 in day light?
My phone has a setting for that.
And it's possible to do with a webcam + monitor: https://askubuntu.com/questions/23593/use-webcam-to-sense-li...
There's probably some software for that.
I think I saw a TV a while back that did, but that's 1 out of the 10 billion models out there.
Instead I much prefer to control it manually via the mouse scroll wheel and DDCI, that way I can adjusted exactly to my liking every moment of the day.
On phones this feature makes sense because as you walk and move around the ambient brightness shining on the screen changes rapidly but on a indoor PC monitor in a room/office, the ambient light is relatively stable because you can control it via light switches or window blinds, so manual control is fine.
I would never buy a TV with that.
CRI tests illumination sources, not displays. I suppose you could crank the display to max white and hold it up to the test pigments; that'd tell you something about the display's filters, but I'm not sure how useful it would be.