"It's a poorly designed grid". PJM might serve 65M+ users, but 2GW isn't easily able to be shipped across their grid. Dominion is proposing a 180mi 525kV HVDC line (ironically enough, from southern VA to northern VA) that can handle up to 3GW). But that's a $5 billion project. That number goes up. A PJM project proposal to ship power from NJ to VA is in the order of $12B.
So yeah, the grid can handle it, but now you're foisting twenty billion dollars of costs on to your users for the benefits of 37 customers. That's a ... pretty raw ... deal for the rest of them.
(And yes, PJM already has a grid that can supply some of those needs, and the reality isn't proposing that they run a new HVDC line just for these projects, but the capacity has to come from somewhere).