Nit-picking to avoid the issue at hand.
If voter support totals are so inconsequential, why did Team Clinton proclaim victory at 3:25AM Tuesday morning? It couldn’t have been based on the delegates, or even delegate equivalents, since you assert they won’t become important or even known until June.
It is the perception of winning more voters that campaigns spin to raise their voter support in ensuing contests, to raise donor support to fund these efforts, and to attack opponents’ campaigns. Winning more voters is the universal measure that the non-wonkish public and the media understand.