Is 802.11n still hub-based network?

Hi All,
Everytime we talk about 802.11 wireless network, we consider it's a hub-based network. However, 802.11n supports MIMO which means while one antenna is transmitting the other antenna can be receiving. To me, it works like a switch, not hub. I want to confirm with everybody if 802.11n still is hub-based.
Any input will be appreciated.

Current wireless technology is still a hub-based network:  when one talks, all stops to listen and wait for their turn.

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