Apple finally responded to concerns that were threatening to scuttle its once-promising wearables category. Its introduction of watchOS 3 at this week’s WWDC has drawn high praise. The Apple Watch represented the company’s attempt to marry the ultimate Dick Tracy smart gadget with the genius of the iPhone, but it fell short. Instead of a convenience, it was far too slow and complicated for many consumers to navigate. WatchOS 3 is a “significant and welcome upgrade,” said Jitesh Ubrani, senior research analyst at IDC.