Are you suggesting the show was all some sort of extended Twilight Zone bit where Fraiser had the consciousnesses of everyone else trapped inside of a world where he was essentially a god, and forced them to play out petty interactions, never letting the facade slip lest they incur his wrath?

Is Maris a living example of what happens when Fraiser is angered to the point of punishment? Is that why we never see her? Is her visage as a being that has no mouth but must scream so horrific that it must be hidden from the viewing audience at all costs?