Will we soon be banned from using red light bulbs at home, because their wavelength is illegal?
Some spectrum is licensed. Some is for public use, such as WiFi, Bluetooth, baby monitors, and many other uses.
How would you like it if someone else on their own private property interfered with your use of WiFi on your property by sending you deauth packets?
I pay AT&T for my phone, including the use of it as a hotspot. AT&T paid handsomely to license the spectrum it uses to provide service to my phone. I'm sure they would not be happy if I am unable to use that service because I am maliciously blocked by someone interfering with my lawful use of WiFi spectrum on my own lawful hotspot, regardless of what property I am lawfully on, such as a hotel.
There always is. Radio waves don't respect walls (unless they're made of metal). If you look at the linked document, it shows strong indications that the attacks did affect wifi networks from vehicles passing by, that is, fully outside of the property.