Four years is an eternity in computing, and what was true at that time is not the case at present, at least in terms of how it relates to a dGPU-equipped MacBook Pro as a dual-boot gaming device. The 2011 MBP was the first system from Apple with a GPU that could game at least halfway decently.
Today, not so much. Compare the current MBP's R9 M370X to the GeForce GTX 960M that's available on notebooks that cost as little as $810.
And how exactly do you propose I take a desktop with me if I want to play games during downtime when I'm traveling on business?
This might mean I'll be waiting for the rumored Mac gaming laptop, or my next Mac will be a Macbook and I'll give up serious gaming while traveling.
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