I'm assuming that the school of thought you are asking about has to do with bobbins used for floss or wire.....bobbins make the material handling so much easier, especially floss when you want it to stay flat, especially true on any kind of a rotary vise. I use the tradional type bobbins more for use with wire, floss, vinyl ribbing , tubing or and thing else that can be stored on a spool. It's just so much easier to handle when contained with something you can hold in your hand.