I think basically what's going on here is every journalist is reporting in the Woodward and Bernstein tradition, where if your reporting results in a big change in policy or (!!!) a presidential resignation, you win all the Pulitzers.
The reason they don't bother with Trump and Republicans anymore is that they don't have any pull with those people. They could run a negative Trump story every day until election day (they have more than enough material) and the best they could hope for is he loses.
It's that, and a large part of the institutional Democratic Party and donor set are using them as part of a push to get him out of the race, and probably also resign to clear the decks for Harris.
I don't know how you get Pelosi on cable news suggesting that Biden take a cognitive test otherwise.
You're 100% right on this. It's the only explanation for why so many people are betting the farm on pushing Biden to drop out. Because if they fail, they look stupid. Especially if Biden wins in November.
At this point I think we have more than enough evidence to say they had a lot of fun during the Trump administration and would like to repeat that experience.