I think another problem is the accuracy of the info and ability to dispute it. I noticed my FitBit (and I'm told with many other wrist-based heart rate monitors

I think another problem is the accuracy of the info and ability to dispute it. I noticed my FitBit (and I'm told with many other wrist-based heart rate monitors) don't do well with sports like boxing and rowing. My chest strap is more accurate, but doesn't get integrated with FitBit's data. I'm sure there are many other unaccounted for issues and often these kinds of data sets can't be disputed because the process is mostly automated and not transparent.