I think it has a lot to do with his Chief of Staff Susie Wiles, she is no nonsense and he seems to listen to her. He was certainly more (relatively), disciplined during this election. Supposedly she has drastically reduced access and the ability of his family and far right influencers to simply walk into the Oval.
My wife hates politics and rarely watches any coverage but together we watched part of one of his speeches in the Middle East last week. The minute he went off script and started dropping the "most powerful, rigged election, horrible people" comments she couldn't help herself..."can't he just keep his mouth closed and enact his policies."
Tapper used to be a journalist, I used to watch his segments on CNN, sad when he converted to mouthpiece. Joe Scarborough is the worst - “I spent, as I’ve said before, two and a half, three hours with Joe Biden in the White House, all over the White House, talking at length, at length and in depth about foreign policy matters. And he was as sharp as anybody else I’ve spoken to and spoke actually like a man who’s been doing this since he was 29 years old and knew world leaders.”
The GOP seems determined to investigate what happened at the end of JB's term, yesterday senior DNC folks suggested any investigation should be stopped now that Joe has been diagnosed with cancer. I hope they continue, not as retribution but I think we as American's deserve to know who was leading the country and how do we stop that from happening again.
The mainstream media is finally acknowledging what happened and they are using Tapper's book (Original Sin), a recent summary - "The inescapable conclusion is that party leaders were well aware of Biden's diminished capacity and were more than willing to mislead the voters."