It would be incredibly easy to update the game's status effect icons, but it is one of those things that is probably given a very low priority.

Really, all the Developers would need is an intern who is an art school major; give him/her a list of the icons with their effects and he/she could give them a fresh new set of gleaming new icons in a few days. On the cost-effectiveness side, that would cost practically nothing besides the electricity to power the computer on which the intern was designing the icons, then a few minutes of a programmer's time to compile them into the existing icon dat files.

Just some food for thought for the Dev team.