I think:

#1 - Mike Pence isn't intelligent or likeable enough to be a credible high level candidate. He's kind of dumb with the flogging of Trump - there are plenty enough absolutely horrible things happening in this country to not focus on a mean Tweets candidate. Also he comes off to me like a hypocritical born again preacher, more concerned about orthodoxy than anyone's personal welfare. Pence is a simplistic no-policy politician who is only known for hating Trump and has fealty for something called "actual Republicanism" in favor of what he has deemed icky populism. He's a much a piece of shit as Mitt Romney - no apparent understanding of the challenges that little people face. FUCK that guy.

#2 - The election was stolen at a level FAR more pervasively than the electoral college count. All discussion was immediately banned and enforced by social media platforms and all mainstream media lined up to ridicule and discredit anyone coming forward for honesty. Even now there's videos surfacing of election workers in Georgia re-scanning the same ballots several times in a row- nothing could be said about it. Even memes like the hockey stick line chart of the Democrat vote count in Wisconsin was utterly disappeared. In short, not only for the reasons you state FSK - the legal momentum was toward certifying Biden. I bet individual TV and radio stations and newspaper press rooms were threatened if they stepped out of line.