I honestly cannot remember if Dan John made this observation in Easy Strength, or if it was somewhere else. I think it was Easy Strength, but I don't have the book in front of me right now.
Dan was discussing the legendary Bulgarian Olympic lifting programs, and how they made use of a great deal of volume. The Bulgarians were apparently quite famous for having multiple training sessions per day, which strongly contrasted with the style of training in the US and many other parts of the world. The assumption, naturally, was that there was some kind of secret scientific research behind this.
Here's the interesting thing--apparently, when Dan got to talk to a Bulgarian coach about this, it turned out that the main reason for the extra training was that it kept kids in the gym. When you've got a bunch of young guys (especially if they're competitive athletes) with free time, they get into trouble. So their coaches would schedule extra sessions because it kept them off the streets. The physical benefits were secondary.
Which makes me wonder--how much stuff have various martial arts accumulated for the same kind of odd reasons? Some Chinese systems are legendary for requiring students to be able to hold a horse stance for three hours; is that because it develops endurance, or is it just a good way to get students out of your face for three hours? How many drills were created simply because the teacher wanted a new shiny object to dangle in front of his students? Do all those extra kata actually serve a purpose, or were they just put together to give students a reason to come back and keep paying? (I know at least one system that added five kata to their system for, as near as I can see, no good reason at all.)
I'm not saying this is always the case, but if a drill seems strange or pointless, it might be worth considering that maybe it really IS pointless. Just a thought.