I think the main issue with fixed even if the story is okay is that it's obvious they weren't allowed to go all-out with the animation. Pic related is the concept art of one of the scenes then the actual scene itself. One thing I immediately notice is Bull has a more dynamic pose, the characters actually have lighting and the background is textured instead of digitally made perfect. The artist also only uses one color to set the mood of the scene. In the final, none of those details are present anymore, and the characters are on-model instead of being allowed to be dynamic. To me this feels like a look into what the movie could be like if the artists were given more freedom, time and budget on this.