I almost don't get the point of USB 3.1 gen2 being pushed on boards, native or not. There are extremely few devices or hubs that are compatible, even though it's been out for years now. When USB 3.0 came out, there was wide support for it across the board within months, not so in this case.
And to be clear, we're not talking "USB C", which USB 3.1 gen2 CAN be, but isn't in every case. We're talking the speed and power spec compatibility. I've looked and looked for devices and hubs to use with my Gen2 3.1 port on my motherboard and there are very few, and what there is, is VERY expensive. Not sure why peripheral hardware manufacturers are not getting this done, but at this point it seems like 3.1 Gen2 is senseless as a selling point until there is a wider adoption at the storage and device level.