Logic model, not a design spec. The foundation follows Spotify's information architecture in Plex's side-nav chrome: a Home hub, a Discover surface, and a grouped "You" zone (Watchlist and My Stuff). Activity is gone as a category, and its feed lives in Home. Flip Following to a top-level pillar to compare the YouTube-style approach, reserved for when follow expands beyond users to titles, cast and crew, and lists.