Gaming may not be Vega's strong suit but that's not to say it can't do at least a respectable job. The whole idea of AMD is to create a product better for a certain price that can do everything you could possibly ask of it (within reason, obviously an R3 SKU for example shouldn't be asked to render a video) at least respectably. Like Ryzen, Vega is a Jack of all Trades.
And what about the RX 560?
amds silent change of the specs
I'm aware. Don't see the big deal though since pretty much everyone buys NVIDIA cards when it comes to budget offerings.
It is, but not for editing. I have a 1070 myself.