I'm just glad there is a standard. It doesn't matter much what size it is. What matters is that I can go to any lumber yard/mill when I need more and get it. What matters is that I and my inspector can look at (or more likely memorize!) some charts and be sure that everything is strong enough. Is actually 2"x4" lumber stronger than the standard sizes - yes, but most of the time it doesn't matter, and if it does I really want to step up to 2x6 (or something) because margin of safety is important when you get that close)