Christ, they're SNES graphics. Improve animation? Improve spell effects? Improve detail on sprites and/or the environment? Better world map? Seriously, some people need to settle down. I never once criticized the game for its visuals.
At a smaller resolution, you have less actual physical space for detail. Unless you want an ultra-zoomed in hyper detailed Chrono Trigger, that has a single character sprite take up half a screen, you cannot just willy-nilly add detail to sprites unless you increase resolution. This is fundamental to sprite work. I just want to make sure you understand that.