Last sentence is where I was talking about that. Nothing wrong with 2x1 or those dimensions as you have said. They get used all the time for various things. I'm aware. Again, used all the time. Easier to tile a square though in both directions.
Yeah, I am talking about power of two non-square ones. Why it's always an issue with them in content creation soft while we have 90% of textures 2048x1024 or 2048x512. End often not even perfectly square texel size for things like road etc
Likely because a knife fits better in a 2:1 uv layout than a square one. Note that you need to specifically unwrap your model to this ratio, and not just export your textures this way. Non-square tends to be better just because you have one longer axis and one shorter, though the more stuff you have to pack, the less this…