You are taking this further. I didn't say anything about the difficulties of being the next President. I only said that Biden will win and win easily as long as he is breathing. I'd be happy to discuss other topics with you, but this all started because I said Biden will win and win easily, because he will. As long as he is breathing on election day.
I will give you the reasons though, reasons that aren't going to change much between now and November.
We will be in a deep recession.
Unemployment rate will be terrible.
Trump is an impeached President, something Biden will talk about if he ever has to talk.
The polls in states where it matters are against him, and it is worse for him than any poll he had against Hillary.
Many of his voters have died since 2016, and the demographics favor Democrats.
People like to think that we have all made our minds up about Trump, and even if that were the case, evidence is that we as a nation have decided against him. But, lots of voters simply look at how they are doing on election day, and if they aren't doing that well, they vote against those in power. There are going to be a lot not doing well.
Trump is a continuing train wreck. He is going to lose big. He basically gave Michigan away with his behavior. Having to talk more and be in the limelight more will not help him.
Biden wins easily in November if he is breathing.