The other thing about these designs is that people tend to keep stuff for as long as it still works or looks good. So, while the kinds of photos you'd find of a "modern living room" in a magazine in the 1970s would look a certain way:

An actual living room would include furniture and decor from the 1950s and 1960s because it was still fine and didn't need to be replaced yet. IMO the image in this post looks to have a lot of 1960s in it to me.

People think of the 90s as being the era of neon, and while it's true that you might see a neon living room on Miami Vice, most people's living rooms in the 1990s were still orange and brown because the furniture and rugs from the 1970s were still good.