I feel like your argument (unless I misunderstand it) self-disproves.
PC is the potentially most powerful platform by far, and -- as indicated by your choice of example -- it's also the one with the greatest variety of game design, budget, and experiences.
Hardware power presents a ceiling on the quality of graphical experiences achievable -- it does not enforce a floor on the budgetary requirements of a game. Furthermore, with the same financial outlay, higher hardware power allows you to achieve more. Your programmers can spend more time writing gameplay code rather than optimizing it, and your artists don't need to worry about each polygon they use but just about making things look good.