Human-Computer Interfaces have different needs from Human-Human interaction, in particular they need to be unambiguous (which the natural language isn't), very

Human-Computer Interfaces have different needs from Human-Human interaction, in particular they need to be unambiguous (which the natural language isn't), very precise and concise. For these reasons Siri and Alexa would be terrible to perform tasks which would be very quick in a shell. Also Siri and Alexa are not local and not privacy respecting.