If you think of debates in a traditional, academic sense sure that makes sense. But the reality is that in the 21st century of social media, etc Presidential debates are not about policy or logical arguments. They are about sound bites, firing up your base, and verbal gimmicks. And on that note,
@Suedesi is correct, Trump is indeed much more skilled at those things than Biden. Only Dems in the last 30 years that I think could perform well in modern televised debates with Trump are Obama and Newsom.