The original Apple Watch wasn’t amazing, but it did what it set out to do. You could answer phone calls on your watch, see notifications from your phone, and even track your heart rate. And with the most recent software upgrade, the watch has speed and interface improvements that refine it further. You can now text from the thing! Or write an entire e-mail. The trouble is that only super nerds want that kind of smartwatch, so for the new version, called Series 2, Apple’s focused on what people really demonstrably want: a fitness tracker.