This. I think people have depth confused with width, since no dynamic that I've heard has surpassed ANY planarmagnetic that I've owned/tested extensively.
Planars are the kings of depth (as in projecting in front and behind), and I'm pretty sensitive to soundstage differences. Their width is what pales in comparison to dynamics. They have a sort of wall that keeps them from extending further out to the sides, most noticeable on the LCD2.
I believe the depth thing is most commonly noticed as "speaker-like" because if it's projected more forward/backward then it will resemble more speaker-like features than a dynamic being more left-right.