There was early information on saddles - but then when Greens, Andersons And final Trophy Line couldn't sell enough and started to falter the info dried up. There used to be some good videos that was shared on Archery Talk about gear and setting up. I think Boswell was one of the early folks to start promoting them on YouTube - but there were older videos out there they just were not very in depth. Most of the advancements have actually come from common folks using them. I remember when Solar Neptune put out the first no stick video, then there was Blackout dude, MTS, etc., and things just kept rolling from there.
But there is no doubt that John E was the man that popularized them and came up with the best way to use them. He was the one that started promoting the short tether. If I still had to use the long tether like most were using 5 years ago (and most videos showed) I would NOT be using a saddle today. I actually reached out to a couple of well know saddle hunters a few years back when I was trying them again - they gave the same old advise. When I picked up the phone and called John E and he spent over 2 hours with me going over how he uses them - I have not looked back since.
I think by nature most of the guys that stick with saddles are a bit of equipment freaks and like to experiment. Its almost like an addiction to get it one ounce lighter, one level more comfortable, etc..... it makes it fun to see what folks come up with.