So can I ask why you think Harris will win? Because I see you consistently defending the Silvers and Cohns, and saying not to discount the weird-looking polls. So what data points to the outcome you expect? Or is it vibes?
1. Ground game
2. Harris doing better with the most likely voters (this pertains to #1 in part)
3. Small dollar donations and volunteers
4. I'd rather be doing well among women than men
5. Because I don't trust the recalled vote methodology, and my understanding is that Kamala is doing better in the polls not using that methodology (this isn't a complaint about weird looking polls; this is an objection in theory that I would use no matter what the poll results might say)
6. Trump is putting a lot of weight on his inroads with young men, especially of color. It's unclear to me if young black men are actually going to pull for Trump. Just as most of the Haley voters and on-the-fence white people will pull for Trump because ultimately that's who they are, I'm guessing that this same dynamic will be at work this cycle for black men. That's potentially a significant difference-maker in GA and NC.
Of these, only #6 is purely speculative. The others are factual in nature. The uncertainty is in the magnitude of the effects. And there are concerns about polling errors, but (more informed speculation coming) I'm thinking that the polls are going to miss slightly in Kamala's direction, especially in blue wall states, because the pollsters will have overcorrected (see, e.g., the recalled vote methodology). There are also issues from 2020 polling that seem unlikely to be repeated.
I'd add another speculative thought, which is that there will be some Trump leaners who are looking at his increasing instability and dementia and just won't be able to cast the ballot for him when it's time. These are likely to be people who voted for Biden, and so they are already skeptical of Trump's bullshit and bluster.