You are evidently in a tiny tiny minority of people with very special needs. The vast majority of users want to get these notifications, and most want to have t

You are evidently in a tiny tiny minority of people with very special needs. The vast majority of users want to get these notifications, and most want to have them sent by email because it is one of the most uniquitous channels along with SMS and allows the recipient to "keep living and check the message later on when the time is right" (contrary to a regular in-app notification). The vast majority of Amazon customers do not have its app installed. And those who do have the app can disable Amazon emails or create filters in their own mailbox, it's not exactly difficult.