This is bigger and better things. Every cancer research scientist with kids probably loses hours of potential work time a month dealing with dumb shit like "we're out of milk" that this would solve. I don't think being super-narrow-minded about "big ideas" contributes a whole lot to the progress of society; if it's something lots of people are willing to pay for, you have to accept the possibility that it's useful and contributes to society in a way that you couldn't think of immediately.