Out of curiosity, what changed in your paint care routine after you availed of their system. Say, frequency of washing, etc.
I guess, to a certaint extent, it could prevent, by virtue of the surface being so slick water won't collect. But paint protect is paint protect. What it could do is protect your paint from getting etched by the dried water (or bird poop) to a certain extent (by means of the sacrificial layer -- the LSP). And to a certain extent means that you have to do your part too. It doesn't mean that because you have paint protect, you don't need to do anything any more. For example, you need not really wash it everytime you arrive at home or park in the office garage, a simple sheeting method would do every time you arrive at home from work too. Not cleaning the car after several days of being rained on and letting the water spots bake out is not going to help the paint protect system too.
In actuality, if you like you could even augment your "paint protect sealant" by... doing the same routine you've been doing before, but do not use any wax removers or anything that'd strip the LSP that was applied. wash, clay, (booster) wax would help.
Don't get me wrong, their system works for what it is meant to do... protect.