Exactly, a cellphone app can get the job done but it is a great cognitive deviation from whatever task you had at hand at the moment you realize you ran out of something(1). So amazon's dash button is not an innovation on getting something done, but get it done faster and more conveniently, and that alone makes sense for an enterprise whose profit depends greatly from understanding consumer behavior. So I agree with TeMPOraL, it is not ridiculous at all.
And there's a bigger picture outside of comparing the convenience between using this little button as opposed to mobile apps, but that's off topic for this branch of the conversation, if you're interested IMHO & my brief reasoning, read this other brach[2] (also because DRY).
And there's a bigger picture outside of comparing the convenience between using this little button as opposed to mobile apps, but that's off topic for this branch of the conversation, if you're interested IMHO & my brief reasoning, read this other brach[2] (also because DRY).
(1): Optimally you realize you are about to run out of something before it happens. [2]: https://news.ycombinator.com/item?id=9299505