From a behind the scenes point of view...
You can explain all day long about the benefits of water sheeting as compared to water beading but at the end of the day people want to see water bead up, that is the visual sign to the average person and even online enthusiasts that the paint is protected.
A chemist once told me that the best protecting ingredients don't actually bead water very well and that when used the formula has to be modified to make water bead merely for perception value.