Since the weave you see is only the top layer, there can't be much difference in weight between 3k and UD. Even if it's 100g, I'd be willing to sacrifice that extra weight for the cool weave pattern on the frame. I would bet that just adding paint is similar to changing from a UD to 3k weave. So if you are that concerned about weight, then sure, you'd want a UD matte finished frame. Then again, how boring is that?