> 2) the fact you can cut A3 into two A4 etc. is great, but doesn't really matter when 99% of the printing paper will be just one size (A4) anyway? This is mor

> 2) the fact you can cut A3 into two A4 etc. is great, but doesn't really matter when 99% of the printing paper will be just one size (A4) anyway? This is more for the manufacturing side. At the factory they really only have to make A0 paper that can then be cut to any other A size without any waste. You can't do this if the paper sizes are not related which is the case with North American sizes. Also the fact that you can fold a A4 into A5 (what is used for letters here) with a single fold is really neat.