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The last post finally got it. To put it a little more clearly, it's so you can have a seal that wraps all the way around the glass with frameless glass, forming an inverted U, just as you always have with framed glass. The older, cruder design is prone to air leaks and windnoise, and is much harder to properly adjust.
It has nothing to do with air pressure in the cabin, or they'd do the same with framed windows.
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