... I'm looking at Dynaudios and Salk WOW1's
Considering the diminutive size of the WOW1 (7 x 9 x 10.75 inches, including a 4.5 inch woofer) my guess is that **in this specific case** the sonic benefits of keeping the deep bass out of the speaker are likely to outweigh whatever sonic downsides may result from introduction of the P6's crossover circuitry into the signal path. And if that proves not to be the case the P6's crossover circuitry can of course be switched out of the signal path.
Without knowing the specific Dynaudio model(s) you may be considering I wouldn't want to speculate on the net result of that tradeoff .
Regarding the dilemma cited in one of your recent posts, every design approach has tradeoffs associated with it. And the net result of those tradeoffs usually depends on how well the specific design is implemented, and on how it synergizes with the rest of the system. So I would not consider the rationale of either company (PS Audio or Parasound) to be specious. And in choosing between the two products I would take into account the specifics of the application as much as possible.
Good luck. Regards,
-- Al