I don't disagree with any of this, but in this particular instance i do think it's simply a reflection of reality. Biden's whole strategy is win over dummy undecideds who can't tell him and Trump apart, rather than excite his base for a good turnout.
Fact is that strategy requires charisma, not brains. Biden's running a strategy on his weakness. It's doomed, which is impressive since Trump is so widely hated. Literally any other dem in there party is a better choice, save Jimmy Carter...