Completely and utterly masturbatory. The reality is that the US is extremely polarized politically because the living standards are collapsing. There are basically two competing narratives for why that’s happening, and people subscribe to one or the other. The democrats and republicans have fundamentally different world views, so nobody is going to be swayed by the debate. People subscribing to each respective view will hear what they want to hear.
People who will vote for Harris are the ones who think that the dems have been doing a good job for the past three and a half years, meanwhile people who aren’t happy with the way things are going will vote against them or stay home. It’s that simple.