Each journey starts with one step. But how do you know how many steps END a journey?
The worst part of exercise is the lack of data. How hard did you run? How much weight did you lose? How many cupcakes can you eat and still stay on track? All this requires the sort of metrics that you just can't get from guess work.
A Fitbit, of course, takes you in the opposite direction. You'll get too MUCH data. You'll know every step, every heartbeat, a whole graph of your day. You'll get stuff that you probably don't care about and probably will ignore. And what will you do with that data? You'll know. You'll know everything. And that'll help you make the hard decisions about when you can and can't have an extra cupcake.
Cheat days are seriously important, after all. You just gotta do them right.