Wilson's use of second order electrical makes it impossible to achieve time alignment in the strictest sense - because the mid driver needs to be phase flipped to provide 'phase' alignment with the woofers and tweeter. That said, the level of phase alignment / coherence achieved is vastly better than average, because the drive units are (or can be) precisely positioned in space for a given listening height and distance. And this matters lots because the small amount of harmonic distortion energy from any individual drive unit is time and phase aligned relative to the other drive units when the speaker is correctly set up. I wonder if this is why Wilson speakers sound so coherent and can also convey a level of realism that many other otherwise fine speakers are not quite able to match? Achieving a flat phase response is obviously preferable - but this is something that's now quite easy to achieve externally with DSP correction. Sure, speakers can be made to work with first order filters, but the amount of driver overlap makes for a very messy vertical polar response which in a typical reflective room can render the benefits next to useless, or at best isolated to a very small listening area. There's also the issue of the phase response of the drive units themselves which becomes more problematic, and usually necessitating the addition of correction networks in the crossover. I don't think it's surprising that many speakers that claim to be time and phase perfect end up sounding less than perfect in most respects.
Isn't this problematic with respect to having to use ADC/DAC conversions when you go DSP? That two step creates signal loss.