Just installed the phone app. Less a "comprehensive view", and more of a pedometer with graphs. You can manually add activities but the only options are: Walking, Running, Biking, Other. And even then, you can only record duration. I suppose there is hidden integration with the wearables, but why can't I manually input the data? If I can't record squats, then what's the point?
I think anyone that is even a little bit serious about their particular exercise/activity will not use this. I cycle and run. I record everything in Strava. Most of my friends do too. I can't really see a reason to use this. Counting steps does not seem to be very useful.
It's hard to think of this as useful with Strava as it's so damn good, but there are many other apps for other activities that are not as nice to use, but users are locked into them as losing all your data means starting with a new app is frustrating.