One app to track that, a different app to track that, a third app to track that, an app or two to be able to export/import to popular PROPER health-oriented websites and services, and then use the integrated workout app for certain things. Oh and figuring out which apps works best for certain activities takes forever, and costs a lot more money than what the watch initially costs. And the ease of navigating a touch-screen, and tiny not-so-very tactile buttons with ski/snowboarding/winter gloves on... Which is something that many people wear 4-5 months out of the year. Yes, this is exactly why I am dumping my Series 3 42mm for a Garmin Fenix 5.
The Apple Watch is a nice iPhone remote, but it can't stand on it's own. The day it can, with proper battery life, I will reconsider it. As of today it's a nice city watch for people that live in an office or a gym though, as long as they have an iPhone.