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https://en.wikipedia.org/wiki/List_of_Super_NES_enhancement_... would have made it difficult to do this on the SNES, especially for great games like Yoshi's Island that took advantage of this.

They did do this for SNES:

Obviously it was limited to games that did not use enhancement chips as you mention.

Easy, just put FPGAs in them :P

That's actually the current solution for SNES enhancement chip games: https://sd2snes.de