Trump is running his campaign like 2016 probably because he won with that style in 2016. Trump can't change, he doesn't grow and doesn't evolve. He's the same spoiled man-child he's always been.
Notice he only repeats the same Tweet stuff. He doesn't like to read and obviously didn't study or prep for this debate as most people would do.
It's probably the most stressful, but easiest debate Biden has ever had. He was winning just going into it and only needed to not fuck it up. He came close a couple times, but succeeded in the end.
Trump has a record. He is not running on vague and silly promises. We know even more what a self-centered crook he is and how incompetent.