Plex gets you part of the way, but for not-tech-savvy people, what you probably really want is a Plex Share, as that will keep you from needing to manage any of the media. You'll have to figure out how to adjust some settings on any TV streaming in 4k for most Shares, but it's not terrible to set up. There's a subreddit for it: https://www.reddit.com/r/plexshares/