This feedback only matters if you are focused on making money long term on this. Essentially: what is your competitive advantage that you can actually sustain?
Edit: I'm asking a legitimate question, you can stop down voting.
In actual fact, Apple have just shown their hand with this with the Apple Watch daily goals. It's somewhat similar, yet I think both can co-exist easily.
In fact, I use both. Streaks doesn't rely on the Health app, but once the prototype was up and running it was clear the app was superior with HealthKit integration so it became a bigger part of the app.
Apple are investing heavily in the health-related aspects of iOS. Your argument could be applied to any app that integrates with the Health app.
(Side note: I also make public transport apps for iOS, so I'm well aware of how things can go, with all the rumours circling about transit announcements at WWDC)