One of the things I wish had come out of the Quantified Self movement (which is now so mainstream, it wasn't even mentioned in this article), was a consensus awareness of how to mentally handle fluctuations when recording more data.

We already knew that things like weight fluctuated in normal people (periods, hydration, meals, etc), but many of us are still defaulting to the inaccurate model of slowly-changing measurements recorded 1x/2x a year at the doctor's office.

I'm sure people will get used to it, and many of the weight apps already wisely show averages to discourage fixating on individual measurements, but it feels like a missed opportunity.