Every time I try to put my square-peg DD12 into the round-hole public school, we end up with a new round of testing to prove that there's something wrong with her. When she leaves, the need for diagnosis magically disappears.
...I probably haven't explained this well, but as a parent of two children who are both intellectually gifted and also have disabilities, it's simply not the same thing as saying "my child doesn't fit here therefore I should test for a disability". My kids' issues extend outside the classroom, outside any classroom, and they don't go away just by finding them a gifted classroom or better overall intellectually challenging classroom.