No Google fit connects into this. It allows apps like Fitbit, Samsung health and Google fit to all have the same data.
So I don't have to tell my watch how much I weigh, my Fitbit scale tells the Fitbit app and that syncs with google connect so that Samsung health can then pass that to galaxy 5 watch.
I find it hilarious that you think people who use health trackers "need" them to get fit, rather than being a source of personal data that helps improve how you manage your diet and exercise.
You could pretty much reduce any use of modern software to that kind of comment. E.g. I find it halarious that people need spellcheck to write things correctly.
It's a tool, and for some people tracking calories and workouts is important. I find it funny that people shit on those that are trying to improve themselves.
Edit: I have a bodybuilder friend that tracks everything he puts in his body down to the milligram and every step and workout including reps. Is he a sad individual? I have another friend that needed both hips replaced and gained a couple pounds and is tracking their information. Are they sad? Sorry but dude, let people enjoy things and do things that don't hurt others.