Well, I would say that is not necessarily true. "The whole reason that you liked the adult section" varies person to person.
We go to Palo brunch for the excellent food, service and upscale decor--if kids were there, we would still enjoy it just as much. Just as we do at Disney signature dining like Cali Grill, Tiffins, Yachtsman etc. which are full of kids but still an elevated experience.
Same for adult pools/hot tubs--we enjoy the hot tubs and pools at Disney World and they are not adult only and often have lots of kids in them (including at the "quiet" pools). What makes the family pools on the ship unpleasant is they are so small compared to the adult pool and the only place families could go--if kids were split between the family pool and adult pool, it might even help thin out the crowd a bit. And it might actually encourage some of the adults to be a bit better behaved if they know they are being watched by kids--I decided to leave the adult pool on the fantasy once because of a big group of adults doing shots IN the pool, being very loud and saying some pretty horrible stuff.
Anyhoo, I still am in the camp that
Disney Cruise Line should keep some spaces adult only (or at least do so for certain hours of the day like the do for the bars/lounges),--but my point is only that for ever person who thinks kids being present ruins an adult only area, there is another person who honestly wouldn't mind. I think they struck a better balance with the Wish of having a smaller adult-only deck area and making the hyperspace lounge kid-friendly during certain hours.