MIMO is pretty common on recent phones Wi-Fi hardware, does that help? I know my last two pixels can create a Wi-Fi hotspot while connected to WiFi as the source network. I've no idea if that's part of the Wi-Fi direct standard though.

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MIMO does help. But even with MIMO, almost all WiFi radios are single-channel operation. The WiFi hotspot thing is possible with SISO as wellz It basically uses the same channel to connect to the network and to host its own.