I don't like the look when the same material is used for walls and firepits as what is used for the patio. Even when I use two different materials I always use a different color for the patio than the walls/firepit. You need different materials and colors to define the area. Same as you wouldn't paint the walls, trim, floor, and cailing, of a room the same color.
Why do people not respect us as they do other tradesmen? Because every Tom, Dick, and Harry doesn't think he can be a plumber or electrician!