There’s several things which break down if you eliminate layer boundaries. Can you still have a layer that is bigger than the image boundary, or would pixels g

There’s several things which break down if you eliminate layer boundaries. Can you still have a layer that is bigger than the image boundary, or would pixels get cropped when they move outside? What happens if you apply a noise filter? Does it generate an infinitely large layer with noise? Or only generates noise on the visible portions? Or some other arbitrary rect in between? And how would you handle the case of a small layer with a weird blend mode like multiply/subtract? With no boundaries it now must apply to the entire image below. I’m sure there are solutions to these individually but it’s clearly a very complex problem to solve all these kinds of cases in an intuitive way.