The idea is that the tape holds the tyre while it rotates. Obviously there will still be a limit where the tyre leaves the rim - but it won't be the tape that does the damage - but where portions of the tyre are still bonded to the wheel, whilst other parts depart company. The rubber rips.
The fact that the tape is nice and light is desirable.
If there isn't a 'need' for shoe goo, then there's no need for a thin coat either.
It's an idea KT started, but I don't see how it helps. It's the reinforcement within the tape that helps the tyre maintain it's shape and prevent ballooning - not the shoe goo. All that would do is add more mass to the tyre, which would make the forces the tape have to hold up against even greater - d'ya get me?
You'd be better off ascertaining the tape that can hold off the greatest centrifugal force, rather than 'gacking up' the inside of your tyres.