Yeah sure but in the meantime there are hundreds of millions of us living in existing housing stock (and many rent), if a room device worked nearly as well as noise cancelling headphones I'd pay $2k for it. That's still fairly cheaper than renovating and soundproofing an entire room.
Yeah that's fair, on the other end I think cities should take noise pollution and reduction seriously. Banning things like fireworks and gas powered leaf blowers can have a bigger impact on mental health than many people realize.