Few pilots are capable enough to fly the aircraft to design limits, then seek that extra 5-10% performance.
It's beyond frustrating sitting in a plane all day long at lower altitudes, limited ranges, lower speeds, because the FAA is trying to buffer the performance envelope for a battalion of golf buddies, pals, idiots nephews, airline SOP robots, marshmellow first officers, unqualified owners, 200 hour ab initio wannabee pilots and so on.