Couches and chairs and only bifl if you don’t let anyone sit on them and cover them in clear plastic like grandma used to More on reddit.com

What I found is that your average 2-3k sofa uses a foam density between 1.6 - 1.8 that breaks down fairly quickly. When you get to the mid tier brands the density improves to 2.0 - 2.5, although some will still offer a 1.8 as an option. These mid tier foams will still break down (depending on use) but are not 10+ year foams. Fyi a higher density doesn't necessarily mean a firmer seat, for example a 2.0 can come in soft, medium, or firm. Next my research led me to the longest lasting cushion you can buy, the spring down cushion. It can also be referred to as spring foam, or spring fiber depending on the material used. It's essentially constructed like a mattress using coils (Marshall coils) to consistently keep the cushion shape. Unfortunately only the high end companies offer these cushions as options. Most of these manufacturers are located in North Carolina, Highland House, Wesley Hall, Sherrill, King Hickory, Taylor King, and Hickory White to name a few. Along with better cushions these companies offer better construction, such as stronger hardwoods (maple, mahogany, walnut, and oak etc...), eight way hand-tied suspension systems, and more quality fabric options. Another long lasting option would be latex cushions, but once again not cheap. More on reddit.com

I don't know of anyone building a sofa like that, but you can certainly get modular seating set up that way as a 4 piece with a LAF power recliner, Armless unit (reclining or stationary), a console unit and a RAF power recliner. More on reddit.com

Look into American Leather or Stressless. More on reddit.com