I agree that Trump's antics, his obnoxious, uncouth personality, his very unpresidential behavior have driven many independents away from him. The strange thing is independents are fairly split on his policies, for some, against some, more or less 50-50 support/oppose. Yet only 34% of independents have an favorable view of him, 55% unfavorable. There's a disconnect in how independents see or like what Trump has done as president and how they like/dislike him as a person. Question 83A. When a group is basically 50-50 on policy, one expects that group to be 50-50 on favorable/unfavorable if their view of Trump was based on policy and his stances on the issues as president. They aren't.
https://docs.cdn.yougov.com/cjd35jrh5o/econTabReport.pdf
Then you have who independents plan on voting for, 35% of independents say Trump, 43% say Biden, 9% state other or third party with the rest undecided. Question 58. Compare those numbers to 2016, Trump vs. Clinton, 46% of independents voted for Trump, he's at minus 11 from 4 years ago. 42% voted for Hillary Clinton, Biden at 43% is up one from her numbers of four years ago. That's a swing of 12 points in the Democrats favor. 9% say third party/other, that's down 3 from 2016. We still have the undecided's, but they usually break for the challenger, against the incumbent. I'd say Biden is in pretty good shape among independents. At least as of today.
But the election is 4 months away, these numbers are dynamic and change constantly, but nonetheless, Biden is in a very good position. We still don't know how this CoronaVirus is going to effect the general election campaign, the debates and the voting in November. We do have a lot of unknowns and unanswered questions.