If it didn't actually occur to people how the NET was going to work, even though the NCAA told everyone what they were measuring, then those people were fools. If there were any coaches that didn't understand it (and that didn't have anyone on their staff that understood it) that would make them just about too dumb to allow near young adults on a regular basis.
Now if you want to say that many fans didn't realize how it would work, then sure, I agree. Heck, we have one here who after all these years can't stop talking about it but still doesn't understand it.