Could you imagine people having a grown up conversation about whether a product has a purpose. In fact, the purpose of smartwatches is a current running debate in the tech world. Many articles exist questioning the need for smartwatches. Smartwatches are far from foregone conclusions.
The same can be said for smartphones or any type of personal gadget - do we really NEED a smartphone over a Motorola StarTAC? Smartwatches and watches in general are very personal purchases. The AW was never meant to replace a smartphone, but rather compliment it. I find my smartwatch very useful so I DO NOT have to pull out my smartphone all the time. It is used for notification triage and at-a-glance information. Siri on the AW3 is simply amazing because it is so much faster (I rarely used it on the S0). So for me it has great value, but for some folks (like my wife) have no use for it - which is OK!