My thoughts are vary similar to chainsaw.
Politically, I get it. I'm maybe less worried about losing votes in Michigan. I am a little worried about sapping enthusiasm from the youth vote. But I am not a pollster, I don't do focus groups, and certainly Harris's team are professionals who know their shit. My only credible argument, or fear, politically is that polling younger generations has gotten tougher and sometimes professionals mess up.
I am more concern from a policy standpoint. And the sentence that bothered me was "Let me be clear: I will always stand up for Israel’s right to defend itself and I will always ensure Israel has the ability to defend itself." I have generally always been pro-Israel. I remember a camp survivor coming to my grade school to show his number tattoo. I get that Israel isn't just some restitution for WW2, but a safe haven for a minority that has had to deal with similar shit for centuries. But, somewhere along the line, I realized there was a difference between "supporting Israel" and "supporting Israel no matter what." And, I think that distinction gets lost. I saw Kamala's statement as "no matter what." And what's more, we all know Bibi watched it. So did all the Likud leaders who might come later. And what they just watched is Kamala Harris demonstrating that military support of Israel is a political necessity. They don't need to do anything for it. So, yeah, I'm disappointed in that sentence.