Hey-I have a crossbite and never got it corrected. I developed tmj and now my upper jaw is smaller than the lower one and my lower jaw juts out. not exactly aesthetically pleasing. I wish I'd had it fixed when I was young. Early treatment is essential for crossbites so that the face grows more normally. Crossbites also make it difficult to eat sometimes, i notice. Asdk the opinion of another orthodontist maye but i think he may be right.
Hope this helps,