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I feel like a lot of people forget that a lot of games made for bad hardware actually have really good base models and textures relative to what the hardware can produce. It's just that they get rendered out extremely poorly so that they can run well enough on the limited hardware they are made for.
For example, pic related. Yes, I realize it's just a regular ds title, but the difference speaks for itself. Guess which one's the base game up-scaled and which one's being rendered on an emulator with anti-aliasing and better post processing. The in-game models and textures have not been altered. Those are the same for both versions of the game. It's just that the ds outputs at like 144p so that's what the game is rendered at.