until you get your preferred dimensions and design elements figured out, estimated volume is a super helpful way to begin gauging the right size of board for you. my surfing progress increased significantly when I started understanding how big of a board I needed based on the volume given. for example, 30L and I never catch waves, 50L and it feels like a cork - do I want that or not... so 40L give or take 5 works pretty well. You can do the same trial and error with the width and/or thickness. this is actually a pretty funny argument saying "linear dimension folk are the chosen ones", but "volume measurement folk are kooks". they're just numbers trying to give us information to achieve the same goal. i don't see how having more or better information is so annoying or why anyone wouldn't want to dial in their ride using whatever data they have to make it make sense. I know now better than to try and ask or figure out volume on a handshaped board but I had to learn how to judge that for myself at some point and after a lot of trial and error. but even for longboards it's an easy quick gauge for how hard do I want to work to paddle vs how much control do I want to maneuver if considering other similar design elements. Also, you can estimate volume without a machine it's just math. the more measurement points you use the more precise your estimate will be.