I’ve grown to loath the Disneyification of classic stories so much that for me “blue dress” (because they always seem to have one) is a four letter word. Never read the original Mermaid, never saw the Disney either, I was done with Disney before they made it.
I’ll give you Beauty and the Beast (most of the Disney version, with the exception of the curse as well as Belle taking the place of her father, wasn’t even similar at all to the original tale), but the others definitely don’t deserve that much of a rap. Besides, a lot of the stuff in the fairy tales quite frankly isn’t suitable for children, like for example having the Evil Queen dance in red hot shoes or the fact that Aurora was raped by the prince (who, BTW, was the offspring of an ogre) during her century coma. I mean, what, are you going to show your three year old Senator Kelly’s liquification from X-Men? Because that’s what showing all the details from the Grimm fairy tales in animated form is going to result in if Disney does exactly what you suggested. We’ve already got a hint of that with Hunchback of Notre Dame where they had the villagers torment Quasimodo just for the sake of it instead of out of corporal punishment or how they included a Gypsy genocide plot by Frollo that wasn’t even in the original book at all.