The contrapositive would then be that if you find some really janky/unreliable feature that people are using, it must be pretty important to them and you should tread lightly when modifying it.
True. I should have specified that the volume of use for poorly implemented features is only not useful for determining that it is a bad feature. Lots of use indicates that it may be a great feature, or that it's not the feature you thought it was (https://xkcd.com/1172/)