First Wi-Fi 7 device supported by Cox.

If you have older devices, there isn't a whole lot of benefit but Wi-Fi 6 can still help in heavily congested areas. Wi-Fi 6E goes even further by using a entirely new band(6Ghz) which almost no one is using. However it's mainly for LOS applications. I am not sure what Wi-Fi 7(be) adds but I will be going down that rabbit hole when I upgrade. I am waiting 6 months AFTER Wi-Fi 7 is finalized which could be as late as 2024.That way all the firmware bugs are worked out.

They would do better to add 900mhz to routers, instead of going higher. 900mhz has a much better range at the same low powered transmit levels. 

But then they can't brag about higher transfer rates...even though almost no one uses that speed.

You can have high transfer rates using 900mhz. it's the width of the band, not the frequency itself that determines the amount of data being transferred. 

Bard says this;

The 900 MHz band is currently designated for narrowband land mobile radio communications. It's primarily used by land transportation, utility, manufacturing, and petrochemical companies. The 900 MHz band is also commonly found in amateur radios, field disturbance sensors in vehicles, indoor and outdoor long-range signal repeaters, cordless phones, walkie-talkies, and many other products.

So blame it on the FCC? Any other countries using 900 Mhz for the consumer market? My guess is interference plays a role. 900Mhz goes further so it interferes further. All it would take is one cheap phone to ruin everyone's day.