First off, let me say that I have the utmost respect for these designs, having heard X series at shows. They are so good, you can tell they are something special before you get all the way in the room- you know what I'm talking about?
When I first heard of these designs, I was wondering how a tweeter could possibly be run full range. A driver itself can only do two things with an input signal: Dissipate it as sound, or as heat (or blow up of the conditions are severe enough.)
My first 'real' speakers were Dynaco A25's. The crossover in those speakers consisted of the voice coil inductance (which rolled the woofer) and a 5uf capacitor which acted as a high pass filter to keep frequencies lower than desired out of the tweeter. Same thing here. The frequency range and therefore the excursion of the tweeter is bandwidth limited not mechanically (as stated in Spatial's descriptions) but electrically. That's a crossover. A sinple one, but it meets the definiion. Dynaco called it a crossover and so would most people, I think. Splitting hairs over terminology is counterproductive in the long run. Having heard the X series, I can say that if these sound half as good as they look, they're a winner.
Trying to hide technical details is hard. An unscrupulous competitor can find out these 'secrets' any number of ways, including buying a pair and taking them apart. Ultimately, it's not just the design but the workmanship and customer relationships that result in longevity in the market.