Gentlemen
When Duke or diyers suggest "improving the XO (is possible)" they are thinking in audiophile terms. So, from our point of view smoothing the speaker's response curve is important here. IMHO, YMMV, etc
So the B&W X-over could be improved IMOI don't think anybody is asserting that B&W made a mistake. Their engineers obviously voiced the speaker for different use and for a different system than what we are accustomed to -- indeed, quite possibly for a non-audiophile customer.
When Duke or diyers suggest "improving the XO (is possible)" they are thinking in audiophile terms. So, from our point of view smoothing the speaker's response curve is important here. IMHO, YMMV, etc