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bmmb1 said:

Since I don't know much about this side of things, let me ask you this - suppose a system supports programmable shaders - do you actually have to program for this aspect or can you ignore it? Because if you can ignore it, doesn't that mean that you don't have to waste time programming for it if you don't want to (?)

You can ignore it, but most developers are unwilling to take that risk on systems like the PS3 or XBox 360. The reason is simple, if games you’re in direct competition with take advantage of programmable shaders you don’t want to give them that advantage.