Delvo
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Both he and Trump are. That makes another factor more relevant here.Oratory skill is essential to presidential politics. For whatever reason, Biden is very weak at this.
(At least the appearance of) assertiveness/boldness/confidence is essential to politics. Compare Trump's boatloads of bellicose bombast and bluster with Biden's blind bewildered bumbling. I believe Trump actually has lower self-confidence, but at least he pretends otherwise, and a lot of people's tendency to favor assertive/bold/confident people over aimless wishy-washy self-second-guessers is strong enough to favor even those who merely fake it over those who don't.