I'm going to go with whatever a manufacturer does they do across the board with the premium lines receiving more sound proofing with thicker materials and glass. The rest is nothing more than creating a positive narrative spin out of necessity.I think the tuning of the sound is done through a few mechanisms.
The latch mechanism and its internal parts can likely be adjusted/modified to dampen the closure differently - like a soft close drawer vs a normal one as well as the sound of the strike plate. The hinge or that little spring loaded door closer mechanism in the hinge area - I'm guessing they can adjust damping of the door closing with that device. The weather stripping - the shape and density of the material will change the way the door shuts. The dampening material applied to the door metal outer skin will change the sound a lot. The interior door card can do a lot of sound dampening on the inside and sound absorbing - and also a firmer door card is important to how the interior door feels. A flimsy interior door handle never feels very good. Adjusting the cabin external air vents to manage the air pressure inside as the door closes and/or the same internally to the door or by slightly rolling down the window like some brands do - lots of options to do the air pressure adjustment, but they tend to all do about the same thing.
I think there's a handfull of components that can adjust to give the ideal door close feel and sound to make it feel "premium" that are not directly related to the mass of the door.
At the end of the day for me - I give zero F's what it sounds like as long as it closes reliably for the life of the vehicle and seals well.