People complain because their Fitbits, Garmins or Apple Watches aren’t perfectly accurate.  Here is some perspective.

This is a pedometer:

It is what people used to wear to calculate distance.  It was inaccurate, noisy and unreliable.  It only measured distance and it was accurate within about 20%

This is a Fitbit:

It is what people now wear to measure activity.  It is much more accurate and reliable than a pedometer.  It isn’t perfect yet but it is getting better. For measuring distance it is accurate within 5%.  It also measures time, heart rate, steps, calories and stairs.

Life is good and getting better.