Not really, because every one of them gives an audiovisual prompt that speech is now being recorded. Nobody mutes those prompts because it makes the devices har

Not really, because every one of them gives an audiovisual prompt that speech is now being recorded. Nobody mutes those prompts because it makes the devices harder to use. You can own every single smarthome device in existence today and quite rightly assume that you are not being passively recorded. These concerns amount to overblown FUD.