that is actually the point though the content needs to be tailored to display well on numerous devices but we are now moving towards content specifically for say resolution and HDR and HFR and so on. Which is very different than before where it was one version for all displays now it is going towards tailoring content for the type of display.

when you say put 1500 LED panels together they calibrate to one another not what the light in the room is. Because they are individual displays that need to match one another to form a whole image.

That also means yes there is a calibration for the content going up on that 1500 panel wall. The content is calibrated to the display somewhat.

I should also mentiin you would need 1500 panels of the same make and model for it to work properly and match.