I'm obsessed with the unspoken rule that every major Disney or Pixar animated film after 2000 has to have action sequences in it.
Or maybe within the studio it's a literal spoken rule, I don't know.
It's not usually a "fight scene." It could be a chase scene, or running away from some sort of physical peril. But no matter what you're pretty much guaranteed a sequence where the characters are frantically running, leaping, sliding, screaming, tripping, climbing, driving, swimming, or flying in some sort of high-stakes scenario. Or they're one footstep away from falling off a cliff or letting go of a ledge.
I don't think it's necessarily a bad thing: I think it's fun and appropriate to take advantage of the animated medium to have your characters be nimble and video gamey and escape from all this crazy stuff that would be harder to believe in a live action film.
Sadly I'm sure the reason it's put in is "so the viewer doesn't get bored."