The super wide bandwidth is on purpose - not accidental. It's also not "old junk", it was serving perfectly fine till some people decided they wanted to change

The super wide bandwidth is on purpose - not accidental. It's also not "old junk", it was serving perfectly fine till some people decided they wanted to change the rules, and even then, work on avoiding interference been ongoing for decades due to different sources of interference. n.b. Wifi (and BT and others) got to use 2.4GHz band because of interference from aircraft kitchens causing a push to make 2.4GHz into junk spectrum with less regulation.