I am not a designer but I often read that it is really important to have a very nice uv layout and I am not sure why.
I know it is important if you want to use textures which are tiling because otherwise you can run some issues with seems but do we even use tiled textures for our current gen games? (I know that there are some cases where you want tiling textures , for example landscapes)
It seems that many artist just go into Zbrush, generate a uniform UV-layout and then paint onto the model, they may even project textures onto the model and it shouldn’t matter how your UV’s are layed out and where you have placed your seems.
What other reason are there that justify a nice manually unwrapped model?