What the author fails to consider is that most people have been running the same hardware for 3+ years now. Most these people I'm sure just bought a standard PC and upgraded the GPU while failing to upgrade the CPU. Plus how many steam users purchases a standard PC and didn't upgrade it? These facts matter the most.
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Most PC gamers are also only interested in playing games. They don't care how good the consoles are, and only bother to upgrade their system just because it is needed to play newer games, not so much for outgunning the consoles, which they probably will without realizing it sooner or later.