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Because the seal is down the bottom, a lot bigger and pushes out when you open it compared to the tiny seal of a presta, which leaves all the sealant in the tiny tube
hippy-
But then the seal is just swimming in sealant all the time compared to presta where it only really gets sealant if you inject it with the core in. Presta also pushes open when you press the top. I don't have anything against the design and I'm sure it works on wider rims, but I think with tight tyres you'll struggle even more with that big valve inside. Also I've never really had a problem with sealant blocking my valves.
chiroshi
How does it prevent clogging other than just making the sealing surface a bit bigger? It's still just a rubber surface making the seal, and you still have nothing separating the seal from the sealant.