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It's just a flat, large surface though and easily broken when you open it compared to the very tight gap of the presta.
I don't know why I'm even explaining this. It's not my product. It either works or it doesn't. I can see how it would work but have no practical experience so maybe I'm wrong.
Presta valves do clog up though and are fucking annoying (I have one now) so I would look at replacing them with valves like these at least to try them.
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.