It has never been exactly clear why the Apple Watch exists. It does a lot of things, certainly: delivers notifications, tracks fitness, makes phone calls, helps you pay for stuff and lots more besides. Your phone does all of those same things just fine, though, so why spend hundreds more on yet another gadget you need to charge all the time?
With the new $399-and-up Apple Watch Series 4, which the company announced on Wednesday at an event at its monolithic new compound in Cupertino, Calif., Apple offers the most compelling...