6 GHz doesn’t improve range, as radio waves suffer more propagation loss at higher frequencies. The 2.4 GHz band actually has the most range. 6 GHz will be cool because there are less users on the band, meaning less interference, and a much better signal to noise ratio. 2.4 GHz is very crowded, and plus the channel widths are much much lower than 5 and 6 GHz, that’s why the 2.4 GHz is slower. But the signal is stronger over a long range.
Also, WiFi7 80211.be will be a beast. I am excited for that. For example, they will have the ability to transmit and receive via aggregated frequencies: you will be able to send/receive Wi-Fi data (simultaneously) over 2.4, 5, and 6Ghz. No Wi-Fi system does that today; they all need a dedicated frequency for uplink/downlink. There will also be up to 320 MHz channels, compared to the max 160 MHz of today. I am looking forward to Wi-Fi 7!