Why does it matter? To me, because it's different for a masterful artist to purposefully create something minimalist (e.g. Picasso) when you know they could make something technically complex if they wished so, vs an artist for which there's no evidence they could create anything else but a few blobs of color.
In the second case, why are they not in the Bad Art Museum? Is it because of financial success of the art piece? Seems odd.
(I'm not trying to dictate anything universal or what others should think, it's just my own preferences and musings about art and artists).