While I understand this concept is outside of your general way of thinking the fast answer is yes. There is inherently a large cushion for enclosed volumes, port area, and tuning is relevant to the desired reproduction and vehicle.
This applies to every day sound systems, and yes they can get rather loud. More often these systems work better with general enclosure specs than they do when some designers and builders try to do what is closer to manufacturing specs.
Being from that area of this industry I can assure you most companies have no clue what their drivers want at all. Not in a daily, sq, or spl.
However, spl builds are a different take on audio entirely. Before you discuss it, build one then we can talk further as you will understand that conversation in better detail.