I don't think I'd compare anime with decent fiction.
Understand this: When a reader picks up a book he enters into a contract with the writer to suspend his disbelief and enjoy the story. It is incumbent upon the writer to keep to the facts and the possibilities within the parameters of his story.
So he can write about Dhaleks, or Ewoks, or Hobbits, or any other impossibly fantastic creatures, but he must have them act in accordance with the abilities and environment he has set for them or his readers will tear up the contract and throw away the book. Laziness in writing just doesn't cut the mustard.