Then what you are talking about is a "table" with cushions that you sit on, right?
Or a table plus a back. that you can lean more cushions against. The comparison to futon frames seems appropriate to me, even if it isn't made to fold flat. I finally learned to buy furniture by convincing myself that: 1) I'm allowed to buy tools when I need them. (Basic assertion.) 2) Shelving, drawers, and cabinets are tools for holding other tools. 3) Chairs, beds, and the like are shelves for holding people.
I alwats though it would be kind of cool to build a futon frame out of shiny square tube and expanded aluminum, then add an appropriately "modern" futon cover. The same kind of thing would probably work for a couch.