From my own experience, it is very hard to engineer a device that can run WiFi full speed along with USB3, especially something like a smartphone, or tablet, where USB3 pins come out right out of the SoC.

In fact, we tested existing laptops on the market for WiFi/USB3 coexistence, and only 1 laptop ever made it flawlessly. It was a quite old Sony Vaio, where USB3 lanes were physically put under an RF shield from controller to the port.