What advantages are there to using 5G on unlicensed spectrum vs WiFi. Seems to be there is a whole lot more complexity doing 5G, would 802.1ax with OFDMA sub-c

What advantages are there to using 5G on unlicensed spectrum vs WiFi. Seems to be there is a whole lot more complexity doing 5G, would 802.1ax with OFDMA sub-channels not be a better way to use that spectrum?