These comments hit the nail on the head. They will probably overperform him by anywhere between 2-6 points (likely more for Tester/Brown), and for the most part, that will be enough for Democrats to win those swing states. Trump is a unique brand from the Republican Party. The Republican Party's brand among anyone under the age of 40 is dogcrap.
So you really think Trump is more popular than the average Republican. Like DeSantis or Haley would definitely be better general election candidates as they unlike Trump would have relatively clean slates which would pretty much doom any chances Biden has of winning reelection.
Haley and DeSantis were polling 1/3 pts behind in Rassy to Biden like Biden is polling 2/3 pts ahead of Trump in QU poll