From the get-go, Apple wanted its smartwatches to be a lot more than smartphone-like gadgets or smartphone companions for your wrist. Obviously, the technology wasn’t there yet to make the first few Apple Watch generations the life-saving products the company had envisioned, but with the recent introduction of an FDA-cleared ECG monitor, the wearable device is moving one big step closer to fulfilling its mission.

Apple is by no means stopping there, with a major health care partnership that’s been reportedly in the works since 2017 finally unveiled by Aetna yesterday. The Attain app developed ...