Earlier quoted context omitted.
> high-end Macs play games just as well as high-end Windows boxes Are you joking? Because even $2000 iMacs come with mobile GPUs. Not to mention CPUs that cannot be overclocked etc. That's comparable to a high-end gaming laptop , not a PC.
Have you been paying attention to Intel's graphics improvements? At the rate they're going, we'll have the power of (current gen) desktop graphics in just a few iterations. I think you could even make the claim that the current Iris graphics are as powerful as current-gen consoles, though you wouldn't know it from all the crappy ports and the lack of a low-level graphics API. (Also, people still overclock their CPUs?…
And where will desktop graphics be after those few iterations? Several iterations more advanced. Integrated graphics will never be competitive with discreet graphics, therefore systems that do not support discreet graphics will never be competitive with those that can (in gaming, of course).