> I also don't like to add further things that require electrical power, and/or that make noise, etc. I mean, the OP's argument is concerning negative effects

> I also don't like to add further things that require electrical power, and/or that make noise, etc. I mean, the OP's argument is concerning negative effects that may be hidden or obscured by the suppliers of such robots. Your comment regarding their use of electricity and that they make noise - well that's kind of obvious... Nobody is forcing you to buy these robots.