Trump is the Republican Party, there is no distinction.
The vast, vast majority of conservatives love him and will vote for him literally no matter what he says or does.
Owning the libs is enough for them, they don't care how bad their material conditions are as long as they get that. Never Trumpers are so few in number that they might as well not exist.
Meanwhile Biden, offering literally no hope or anything worth a shit to people, will convince very few that didn't vote for Hillary 4 years ago to do so for him this time around. Not enough to win at least.
It's like Chapo said: The choices are screaming defiantly into the void as you die and hurting the people you don't like along the way, or dying quietly reminiscing about "the good ol' days".
If those are the 2 choices, the former is gonna be way more attractive to people.
No one has been talking about the Libertarian party, who had a weirdly unenthusiastic primary and depressed turnout. Hell, Vermin Supreme looked like he had a semi-decent shot to take it at one point too. There's very little that Libertarians can offer that Trump doesn't right now, and I think Trump has the Republican base locked down tight, add some of the 4.5 million Libertarian voters from 2016 and I think he'll take it handily (🤮), for the reasons you said
Hell, wasn't Sam Seder leading their polling at one point?
IIRC, the polls Sam led in where entirely online based? But it's been a while so I don't remember the specifics but yeah Seder was at least a name in people's mouths this year