Ron,
I think the article has some good points from a mac perspective, but they also show the glaring reasons for not getting a mac for gaming.
They stress this advantage in the first point:
"In theory this means a more console-like platform than Windows for developers..."
Really? Console-like performance? No one gets a gaming machine for console-like performance. Gamers get machines to push the envelope, not get hindered by something that looks similar to their XBOX, Playstation, or Wii. I can say that the graphics cards in all of the Mac options cannot push most modern games at high performance levels. With even the Mac Book Pro, which has a dedicated graphics card, my friends cannot turn the graphics to maximum settings and get it to remotely run well on my Samsung UHD 4K monitor.
Now, the rest of the article is subjective and really didn't address the reason why gaming is not an option on any mac. Integrated graphics and dual core processors are good for word processing, but it is not an option for a gamer who looks for the best options without spending six grand to get there.