But D&D is tailored to be a game of addition. After all, to achieve any action in the game, you usually have to roll one or more dice and add them to something.
But D&D is tailored to be a game about social hierarchy and upward mobility. After all, one of the most important things to determining a character's power in the game world is his level, and he is constantly supposed to be working upwards towards the next level.
But D&D is tailored to be a game about psycopaths and sociopaths. After all, the majority of the game is about killing things and taking their stuff.
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In short, I think you're fixating on one small element of the ruleset and unfairly/inaccurately characterizing the entire game on that basis.