Any deeper wading and they would float. In standard form imo they would reach the cape without water reaching the engine, I don't know of any other 4bys that could claim that. 
Imo a snorkel could be added through the d5 or New defender side vents easily, however imo, its simply not needed.
In regards to new landrovers going offroad once a decade, this forums full of people that would counter that. Also I'm sure people said exactly the same thing regarding the original Range Rover classic, when comparing it to the series defender.
In regards to also not being utilitarian,  I would say that in fact this design is extremely utilitarian and it goes above and beyond It's competition even the ones that come out of the factory with a (fake) snorkel.
It's different but it seems to work extremely well so credit where credits due
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