So is Epcot. So is DHS. So DAK. So is DCA. They are all different. Saying "it's different" isn't making a point. The question is wether it is "different" in a way that should eliminate alchohol. Other than tradition, I don't see how one could reach that conclusion. MK isn't designed just for, or even predominantly for, children. If it were, Space Mountain, Splash Mountain, and Thunder Mountain wouldn't belong, because so many children can't ride them. Sure, it's probably correct to say that MK, more than other parks, is aimed at families with children, but just about every nice restaurant outside of MK that is designed for families with children has beer and wine, and we don't tell the owners of those restaurants that their place is "different" and shouldn't have alcohol.
So we're left with "tradition" as the thing that is different about the MK. I certainly never complained about the lack of alcohol at MK. I like the tradition, and I don't feel the need to have drinks nearby all the time, but the breaking of that tradition won't bother me either.