PSD file as texture

I didn’t know “Maximum Texture Size” still caps as 2048px. Kinda weird the word maximum just means twice the normal amount.

Because when I am bringing large plans as raster I have brought them in as 5000px before, and it would mean the excess is wasted.

Does this 2048px cap apply when it is displaying the image? Or the raster that’s embedded into the file will be trimmed as well?