If anything I wouldn't care if the solarium opened up to families for more hours and find it weird when venues other than bars exclude children. Kids on board makes for a much more balanced experience IMO, and stops ships from feeling like they're floating retirement homes. I love older people on cruises too, don't get me wrong, but I don't want to feel like I'm only travelling with a bunch of grumpy "you kids get off my lawn!" types.
I love having kids around and I've never been bothered by kids in years of cruising, and find the ones who do complain about kids are the same sorts who constantly complain about everything else anyway and will never be satisfied, kids or not.
I've rarely seen any of these "badly behaved kids" on Celebrity, and in general I see far more rude or badly behaved adults than kids on cruises.