Surely that was thought about. A problem in Michigan and overall there is a good bit of antisemitism nationally. Perhaps if Gore hadn't picked a Jew he would have won. Shapiro would have pretty much guaranteed Pennsylvania. But there were other pros and cons.
Harris and Shapiro both coastal lawyers so too similar. Harris is married to a Jew so to many Americans that would look too Jewy. One Jew maybe but when you add a mixed race woman president plus TWO Jews, mainstream America balks. Also it was thought that Walz could help with the midwesterner regular white guy working class vote. Shapiro certainly couldn't have. Perhaps most important but hard to ever know for sure, Shapiro is very alpha male, and he met with Harris and said he wanted more of a co-presidency where he had leadership on certain issues. Harris who wanted to be the first woman president couldn't stomach that. Understandably so. Remember vice presidency is a pretty awful job. Be a yes man and be a warm body if the president exits.
Reading between the lines, I can tell you that based on media I read, American Jews weren't angry about this. Aware of it but understanding. The number one issue for American Jews in this cycle was different than other groups. No, not Israel. Saving American democracy. If Harris had good reasons to think Walz was a better bet for winning than Shapiro, then it was a reasonable choice to make. Of course neither ticket would have won. But if Biden had stayed it would have been a REAL landslide perhaps as bad as Mondale. Trump Harris wasn't actually a landslide but it was a clear solid win.
If there are future elections after maga / Project 2025 has their dark way with American democracy, definitely Shapiro will be one of the potential democratic stars. He's more of a top of the ticket guy.