No knowledge of the Wilson crossover, but I can well imagine the idea of taking a carefully-designed and optimized crossover and handing it over to the audiophile masses, most of whom do not understand the engineering design and trades that go into a crossover, would scare me. Especially for such a high-end speaker system; who wants a bunch of people hearing and not liking an expensive system due to the owner's poor crossover design? There's a lot more to it than just setting the slope and the frequency...