Depends on the other surfaces. If the ceiling is hang tiles, rough wood, or fabric panels, there is such thing as too well damped. Most rooms have a happy zone of about 30-60% reflectivity. More sounds like a bathroom, but less can be equally unnerving to people. Also, polished concrete is ubiq due to it being cheap, easy, and looking decent for a long time. That 4x4 carpet is not much better, and is the similarly priced, equally soulless, alternative.