I've heard people on these forums saying that there's no need to worry about disappointing GPUs in future MacBook Pros and Airs because with Thunderbolt 3, there are finally going to be viable external GPUs. They also said that these exist already and that they won't require dangerous hacking to make work, including on OS X. Is this the case? Because I can't find them anywhere... I really want to believe it's true, it would basically solve the issue of the GPU being the only major bottleneck to consumer Mac performance.