Perhaps not. My subjective experience of my Withings scale is that the reported fat percentage has at least remained where I’ve expected given my general activity level. ie, fat percentage goes up when I’m sedentary, down when I’m active.
But it’s more a curiosity than a useful metric regardless.
Honestly I don’t care enough. If I happen to be in the interface I’ll probably turn it off, sure. It doesn’t inform any decisions, I barely register that the number exists.