Imho the most important message about 1980—which folks around here keep forgetting because they are stuck on normalcy bias—is that a lot can happen between March and November—and that can radically affect the results of the election.
Sometimes I think the posts around here are busy plotting moves on a chessboard—when in November the chessboard might have burned in a house fire and the new game may have a name that has not even been invented yet.
I am with you. Biden is also looking at Reagan and how he won reelection. Reagan was originally behind but then the economy started turning around election year and by election day Reagan won in a landslide. As you pointed out 8 months out and a lot can happen.
That said.. the country is more polarized today and both candidates are a known quantity and most have probably already made up their minds. But a BIG swing upward in the economy or stock market or both might pull Bidens numbers up enough to be reelected.