One area in phase that you is always left out is the phase of the midrange cone during playback. If you look at the Wilson midrange it's out of phase as it's not a true pistonic driver. That's not marketing hype by Vandersteen.
I have no idea, but I wonder if the pre 2000 cones were phase correct for any speaker? There are break up's when they aren't pistonic and it throws things out of phase.
On the flip side of phase, not everyone is effected by it. Some folks don't even notice it, but they may notice soundstage depth and pinching in the rear. Those who don't notice phase anomalies may be more aware of stage size etc... We all hear differently.
I'm the first to say that I couldn't listen to Wilson speakers until recently. They have done a great job of making a dynamic speaker, that is non fatiguing, but to MY ears lack the micro and macro details that I am aware of as my Vandersteen's don't smear. It effects the leading and trailing edges per say.
All speakers have to have compromises. It's who's compromises you like best or who's marketing you buy into. Makes it fun.