CNC is great, but even the best machining requires knowledgeable hand fitting. Why tin ribs today? Because it is still the best method for high quality guns. Karl Lippard has made double rifle barrels from a single billet of steel, but that venture was not well received by the market. Mono block superior to chopper lump? I'll politely disagree with your opinion on that. I love modern technology and we use it daily in our shop. That does not change what goes into a best gun though. It still takes LOTS of time, hand work and the best raw material available.