Williams syndrome: high empathy “disorder”

I never heard of Williams syndrome until I watched this video. People with Williams Syndrome are missing genes on the 7th chromosome. Characteristics include “elfin” facial features, slight cognitive delays, sensitivity to sound (and a love for music), and extreme friendliness, which includes high empathy for others.

I’m not sure this should be classified a disorder after watching this video. These kids just make you smile.

https://www.youtube.com/watch?v=gF4DiqEdN3w