Moore's law. You can get a twice as powerful device in two years time. Also, who knows what the smartphone world will look like in two years time. Reverse the

Moore's law. You can get a twice as powerful device in two years time. Also, who knows what the smartphone world will look like in two years time. Reverse the question: Why don't manufacturer only support it for 6 months, or until the next phone comes out? What is preventing that from doing that?