When I moved out on my own, my wife and I moved into a two-bedroom trailer. We didn't have a lot of stuff, and so, one of the rooms largely "sat there," and we never used it. Fast forward a few years, and now, we live in a house with three bedrooms, a garage, and a basement. We've lived at this house for a few years now, but we honestly still haven't found a purpose for everything in it. The basement and garage are exclusively used for storage (I don't park my car in there, for example), and we have two rooms we don't use at all (one of them does aesthetically look like a study, but we don't actually use it). For the most part, we use the bedroom and the living room, and that's it. I imagine that'll change when we have a kid though.