$84/adult pre-fixe menu is not exactly a children's restaurant. The staffing and interiors are above the norm. It is designed to be more formal than your average restaurant at MK. Children can of course go, but it's a fancier meal for them to meet princesses.
The last time we ate at CRT we had gone home first, changed into nighttime dinner attire and returned to MK.
I work in Manhattan so none of the dining options on property are really that amazing, but we and many others elevate certain restaurants. Makes for a better date night with the wife.
Tell that to all of the guests who get engaged at CRT (not me, but I have seen it many times). It has a special ambiance, maturity and elegance that is above most of the other dining options in the park.
Hasn't happened yet for dinner. Maybe breakfast/lunch.
The parks were made for adults too. There are certain areas designed to be more mature than others.
Those are certainly great examples of more formal dining options. I would add Jaleo at Disney Springs to that.