19/90 movies have a female protagonist. That’s only 21.11% of Disney animated feature films.
To really understand what makes Zootopia so unique, it’s important to take a look at female primary protagonists in theatrical animation, particularly the royalty. There are relatively few female primary protagonists in American animation, and a large number of them have either been royals or women whose love interests are royals.
The primary complaints were that the original She-Ra was a “symbol of womanhood”, and upheld an idealized example of femininity while the new She-Ra did not. These complaints were made before the show came out, after only looking at a handful of images.