There could be more :D!
The resource gathering progression has improved from Legacy by 10 times. Many different types of items, but there hasn’t been any addition of anything else to gather.
Many early civilizations used metals found in rocks; copper, malachite, obsidian, etc.
As more progression we could utilize copper in tools by applying upgrades to pre-existing items - eg: Salvaged Ice Pick -> Item Copper Weapon Reinforcement -> Apply Item to Salvaged Ice Pick -> Now that specific pick has more durability/ harvest potential etc.
Could have weapon upgrades with Obsidian (Mayan) or even decor and wall art with these polished black stones. Adding an place-able item like the repair bench but it’s a stone smoother or something along those lines would be a feasible way to make house art.
Another place-able item similar to the furnace could be the wooden stove (metal + wood + stone) - an oven that could save your meat, but at a price for cooking a lot more wood and requiring a fair bit of metal to make. Unlike the campfire it wouldn’t burn your meat until it had been cooked for much longer.