The most common use for PC's is Microsoft Office, web browsing, and email. None of those should be 'pushing the current CPU and GPU capabilities.' Most people aren't gamers or enthusiasts, those groups don't drive the market anymore.
Lets also keep in mind that most publishers would like to sell games to more then the 4 (size artificially small for emphasis) people who buy the latest graphics card every 6 months. That means targeting hardware on a 1-2 year lag at least. Hard core gamers, while a market that spends money, is very small. Targeting the most powerful doesn't make sense.
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The most common use for PC's is Microsoft Office, web browsing, and email. None of those should be 'pushing the current CPU and GPU capabilities.' Most people aren't gamers or enthusiasts, those groups don't drive the market anymore.
Lets also keep in mind that most publishers would like to sell games to more then the 4 (size artificially small for emphasis) people who buy the latest graphics card every 6 months. That means targeting hardware on a 1-2 year lag at least. Hard core gamers, while a market that spends money, is very small. Targeting the most powerful doesn't make sense.