Using them as merely as a distraction and cutting screentime would fix the issue with the Ewoks. My biggest issue with them is that when watching them I know there could have been something more substantial in their place. And I’m not speaking them being replaced by a new species; I’m talking about character development, character interactions or generally fleshing out the story. If so much time wasn’t spent on the Ewoks we could have gotten scenes where Luke actually completes his training.