No it doesn’t, and I actually very much agree with you that “opening a Democratic primary to non-Democrats” and “adding more idiots to [any arbitrary decision-making process” are at minimum non-obvious strategies, and I’m not arguing for them.
I’m saying that “ability to consistently and quickly see through misleading statistics” is a vastly higher bar than “exclude idiots,” that even the latter has little to do with “exclude non-Democrats,” and that charts like the one above will cause problems and distortions no matter who is allowed to vote in a primary. Almost all the deciding power in our political system resides in those who exclude the other ~300 million people who never show up in polls and charts, rather than in the voters in primaries or general elections; press and parties hold much of that power; and misleading statistics and strong framing effects can influence all of us.
