Julianne Moore’s character has Alzheimer’s Disease. She and her family deal with it. The end.
When you see a movie, television show or play, read a book, play a video game or any other form of entertainment, one thing is certain most of the time: you want to root for your protagonist. For a fish out of water viewer who has no idea what they’re watching, you need a character whose as clueless and out of the loop as they are so they, the viewer, has a connection to someone they’re watching and observing.