I think that's trivialising the work that the engineers have done. Sure you could roll off the highs with a filter but that also introduces other effects.
What B&W have done with the longer Nautilus tube is to reduce the back reflection from the enclosure behind the tweeter. In some ways, I am reminded of what KEF did with the Meta. Its a subtle change which doesn't change the underlying character of the tweeter but reduces the effect of the back wave reflections.
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