A good reason not to have a NPV.Where you live should not determine how much, if at all, your vote matters.
I think your Constitution is missing a page...The current state-by-state winner-take-all method of awarding electoral votes (not mentioned in the U.S. Constitution, but later enacted by 48 states)
Each State shall appoint, in such Manner as the Legislature thereof may direct, a Number of Electors, equal to the whole Number of Senators and Representatives to which the State may be entitled in the Congress...
I see where you have made your mistake. These States change, some elections they will matter more, some less. But with a NPV, the same smaller States will never matter, and be left out of every Presidential election. Only the high population areas will matter, and the President will always be chosen by a minority of States, the same States, over and over.Candidates have no reason to poll, visit, advertise, organize, campaign, or care about the voter concerns in the dozens of states where they are safely ahead or hopelessly behind.
That's called "tyranny of the majority.” We fought a revolution to avoid that.National Popular Vote ensures that every voter is equal, every voter will matter, in every state, in every presidential election, and the candidate with the most votes wins, as in virtually every other election in the country.
Under National Popular Vote, every voter, everywhere, would be politically relevant and equal in every presidential election. Every vote would be included in the state counts and national count.