@pi55d@yourwalls.today my guess is that, to my knowledge, on phones overdraw is VERY expensive. And unity is WELL KNOWN to FOR SOME REASON (money) only actually care about phone games. So they made the default that only suits mobile games. Except if you use custom shaders (most games do I imagine?) and have 2 textures of the same size to overlay on top of each other (a fairly common thing in 2D games I would say) as inputs in them and expect them to have the same UVs because they will have WILDLY different UVs since the meshes are completely different. This is my exact situation.