its probably because disney wants people to forget about victory through air power (WW2 propaganda) and song of the south (racism)
Basically, is the movie an animated movie with some live action, or a live action movie with some animation? This list covers the former, but not the latter.
Why some sequels and no other ?
This list includes only movies that are part of what is known as the Disney Animated Canon, which means:
In contrast, see the full list of Disneytoon Studios movies here, and the full list of Pixar movies here.