While this is convenient, there are some downsides. The most obvious problem with 1-Click Ordering is security. If you have 1-Click enabled on your phone and you lose it or it ends up in the hands of a child, there’s nothing to stop them from ordering stuff with your phone. You might even place an accidental order yourself when you’re not paying attention.
Some orders can also go through a little too quickly to change your mind. Say a child takes your phone and orders an item that qualifies for free one-day (or same-day) shipping. If you don’t spot it immediately, the order could ship before you have a chance to cancel it. After it ships, you’re not dealing with a cancellation—you’re dealing with a return. It’s happened before and while it’s not a nightmare, it’s certainly an inconvenience.