If you're just looking at the electoral map, this seems like a ding against him. I think it's doubtful Beshear gets Harris Kentucky, which leads to the question of whether his regional appeal is enough to win any of the rust belt states.
By comparison on this point, Cooper arguably gives Harris at least the possibility of picking up a purplish North Carolina (though I'm not sure I give that better than a 50% chance).
The main knock against Shapiro, as highlighted in the New Republic article, is his position on the Israel/Palestine war (although the article seems to imply that any Jewish VP pick is risky). I understand the need for Harris to make a safe pick, but is this really the single issue that can decide the presidential election? Are those voters supporting Palestine so entrenched that they think a Trump/Vance administration is going to do them any more favors than Harris/Shapiro?
I'm not saying this as someone who thinks that Shapiro is the No. 1 pick. But I question the New Republic's writer who believes a Shapiro VP pick could be fatal to Harris's chances of winning.
Short version: What the fuck do I know?