Rather than asking why some styles are timeless, it is more useful to ask why some styles age.
Usually styles age when they attempt to push the console's limitations to the point where all they can do is approximate what you're looking for. The problem with approximations is that you can always make better approximations, and if the style gets popular enough then this inevitably happens; usually it seems to take about six months.
The best way to future-proof your graphics, then, is to use a style that can't be improved upon just by swapping in a few new algorithms.
Complexity is not depth. Machismo is not maturity. Obsession is not dedication. Tedium is not challenge. Support gaming: support the Wii.
Be the ultimate ninja! Play Billy Vs. SNAKEMAN today! Poisson Village welcomes new players.
There is much to hate about modern gaming. That is why I support the Wii.
