> These things are about targets, trends, motivation and comparing one day to another.
I wouldn't have one of these anywhere near me, but observationally the main use seems to be one-upmanship against the next data subject wearing a similar device, so just a variation of the last aspect of the statement seems to be a significant factor. As such, these warnings of inaccuracy are probably appropriate, as people could be basing their "targets, trends and motivations" against metrics that may not be as healthy as expected.
It's easy to see a market for such devices, but gosh, in the modern context, it's hard to see any valid overall good of a mass market in them.
Biting the hand that feeds IT
