Overwatch game director Jeff Kaplan confirmed the news, acknowledging that the company has longstanding support for Apple's computers. However, Kaplan says the company focused its efforts on Windows due to the "technology behind Macs."
"Currently with the technology behind Macs and the way Overwatch runs it's just too challenging for us at this point to support it," Kaplan said. "Our focus right now is entirely on PC, Xbox One and PlayStation 4."Kaplan didn't specify what Mac technology was making it challenging for Blizzard to make the game for OS X, but Apple's support for graphics technologies such as Metal and OpenGL may be part of the reason. Some of the early developers who committed to Metal, such as Adobe, have backpedaled a bit as they work with the new technology. Apple has also been criticized for not adopting the most recent versions of OpenGL, which is also heavily relied upon in modern game development
Most recently, Blizzard launched free-to-play multiplayer online battle arena game Heroes of the Storm for Mac OS X on June 2, 2015.