Well look at wifi vs bluetooth. Wifi and bluetooth both use 2.4ghz. But wifi has a lot more bandwidth on 2.4ghz. Maybe because it uses more channels (a bigger frequency range)?
But there is room to improve bandwidth, even over distance. Tho how would they have done that, no idea. There is need for more time so devices with the tech can arrive on the market, and be tested.
But also more time so more specialised content can be produced to inform us normal people.
I am sory for not living in a giant home without any 2.4ghz neighbors around me.
Also I myself use 2.4ghz for low bandwidth devices, and other connected devices which don't have 5ghz. And there are also the neighbors who cast their 2.4ghz network they may use how they will around me.
But I didn't have many issues on most of the headsets I tried. At least higher end.
There were still some outliers and with bad unreliable connections, even on high latency (jbl tour one m2 for example).
Others like corsair headsets had issues at "high" range (like 10-15m through walls), but no issues at close range, but that is expected from their specs.