In my opinion, the debates aren’t going to accomplish anything, because the only people watching have already decided who they’re voting for.
Debates are useful when the candidates have only minor differences on issues, and use the debate to clarify their stances. That’s not the case in this election.
I think that President Trump should have spent his time listing what’s he accomplished, instead of arguing with Biden. But he knows a lot more about how to get elected and how to do his job than I do, so I’m not really qualified to criticize him.