"Shot quality".
That term tended to be one of the major counter-arguments against writers who predicted that teams like the Minnesota Wild, Toronto Maple Leafs, and Colorado Avalanche were likely to see an overall reduction in production after defying possession based metrics the season before.
Such arguments were frequently discounted by statistics supporters as qualitative analysis in the guise of quantitative data. While intuitively the concept of shot quality would seem to make sense, with no way of consistently tracking and evaluating it, it was almost impossible to assert causality in trying to explain why certain teams could be out-possessed so thoroughly and yet still win.