Vega isn't particularly heavily focussed at gaming(It did seem to be at some point in development but then the AI boom happened and the gaming-related features like DSBR & Primitive shaders seemed to get mostly shelved), but it's hard to argue the same applies for all of AMDs chips & architectures. Traditional GCN started out in a similar position but by later revisions (Consoles & Polaris) it was pretty well optimised for gaming & generally managed better game FPS vs raw compute power (FLOPS & similar GPGPU measures) than any architecture before or since.
Navi looks like it will do the same. While the general architectures of the enterprise grade chips do trickle down, generally by the time they reach small-die variants that have much more of a life in mid-end gaming cards than enterprise cards they've been gutted of many of their enterprise grade features (Double precision compute, EMC support, ect) and had their resource allocation tweaked to better suit gaming purpose, which brings along the improved efficiency at the task through minimised "dead silicon" and better fed units. NVidia's RTX cards aren't particularly efficient gaming cards either for this reason, and the same could be seen with many of the Titan variants that focussed more on compute performance.