The quality is not in the construction per se, it is more in the selection given tolerances. Yes, after the blade is built and selected, it is easy to say "ah, this and that and this and that about the blade make it special", but no one can manufacture a blade and be very sure the blade will come out as planned, even in the hands of the player, there might be subtle things the player doesn't like. The simplest way to see this is to test the variety of frequencies and weights you can get on a blade when you have 4 samples of it. Wood is a living thing with different densities so being precise on what the wood will do in the blade is a fool's game, you can be broadly accurate. When you have 10 blades and can measure 10 of them, you can discard and sell the ones you don't like and give the ones that a player likes to him. After the pro picks the blade, you can say the quality of wood is different. But no one said, let's build this blade with much better quality wood, this will make a better blade - that is in the mind of people, not the reality. You can build crappy blades from beautiful wood.