Talk to any game developer and they will tell you there work is targeted at the base line spec of hardware which still today is not even fully DX8 thanks in part to the GF4 Mx.
This reminds me of the PS1.4 vrs PS1.3 arguments all over. ATI fans were singing high praises that PS1.4 was way more efficent than PS1.3. Now we have things reversed and its the other side signing the praises. Oh well....