I can assume only that either I am off my rocker,
Do you even own a rocker?
By definition, modal frequencies are at their highest pressure and lowest velocity at a wall boundary. Hence, platforms against the walls can use surface vents into the platform to directly affect ("knock down") room modal response differences in the seating locations. Frequencies creating nulls in the seating locations would be the first focus. Those creating peaks in the seating area are secondary since other mechanisms are available to resolve peak issues. (Clearly, a frequency creating a null in the seating area, could also create a peak in a different position in the seating area.)
Platforms can be, and have been, used as low pass filters or for broadband absorption. Typically, you'll see large areas of the platform surface in steel grating where broadband is desired, or a hole pattern (ie, 1/4" holes every inch of the platform surface) where the platform is to function as a low pass filter. Very clearly, the nature of the carpet and pad is a very important consideration where the intent is "broadband" or "low pass". The restriction of air flow can just as easily work against you as for you.