You cannot base a whole movie on just the imagery alone. It has to be the story and the characters.
The objective of Pixar is to combine creative talent and proprietary technology to create computer animated films with heartwarming and memorable stories and characters. Pixar has a "story first" approach in all of their films.
Pixar's films speak passionately to the audience. They share emotional stories that resonate with everyone, and include relatable characters.
Pixar's true beauty in their animation is the way they create stories and characters that remain with you forever.
Pixar's stories consist of time-based imagery that can be fantastically surreal because of its unique process of realisation and understanding.
I found another great quote today about Pixar's believe in story and character:
No amount of great animation will save a bad story.