The biggest reason it's bizarre is that literally NO ONE in the country is voting for Biden.
There are only two types of votes being cast - (1) votes for Trump (2) votes against Trump
I love a lot about the guy and what he's done, but there is no doubt he's the most polarizing figure in American political history.
He's not a politician, and he's not PC even when he tries to be. He gets a lot done - like a crazy inhuman amount, and of course there are two sides to each issue so he's simultaneously making half the country happy and pissing off half the country at all times.
He's probably the first person to ever treat the presidency more like something that he wants to do than like it's an accomplishment - meaning in his own eyes he's not defined by it.
Biden and his campaign, and the entire DNC, all see the truth and realize Biden's best chance to win is by saying NOTHING that would worry the folks voting against Trump. Hide him as much as possible, don't take positions on anything (like court packing, fracking, taxes or what he's actually do different on Covid). They fully know their platform is only "vote against Trump"
Hell, they picked Joe and took out his competition because Joe has been a politician for 50 years and knows how to stand for absolutely nothing.