I think the thing Shapiro gets you (besides PA) is the reason he does so well in PA. From what little I have seen, I think he can help with the union/labor vote, which I think has slipped from the Dems in the last 20 years, and maybe the biggest gap with taking Biden off the ticket. That's important in PA, WI, and MI. Big upside.
But I don't think it is worth the baggage regarding the Palestinian/Israel issues. I don't know if folks appreciate what a wedge issue that is, especially amongst the youth vote. I assume the Dem strategy is to talk as little about it as possible. Having Shapiro makes that impossible. If she picks Shapiro, she better have a clear position on the conflict (including military and economic support for Israel), because otherwise it will be seen as a tacit acceptance of Shapiro's views, which includes arresting protesters. I think that loses this election.