Maybe. Bear in mind that Trump has to reorient his campaign machinery to attack Harris now.

Sure. But unlike Harris, Trump's campaign machinery is in place. And as I noted in another thread, Trump finds his attack lines by trying them out on audiences. Both of which suggest that the prudent tactical move is to get Trump in front of crowds during the critical time when Harris is trying to get her campaign launched.

Can't have it both ways. And your point about "the veep isn't in charge..." is irrelevant. She's the public face of this administration.....

I think you're conflating whether the Veep can be tagged with the accomplishments/detriments of the Administration and whether the Veep is fully briefed on every aspect of domestic and foreign policy.

The former is absolutely true. If you're part of the Administration, and there's some problem or issue that comes up in some random department (say, a train derailment under Department of Transportation), you're going to get nailed as being part of the Biden/Harris Administration that allowed a train derailment. But that's very different than saying that the Veep knows (or ought to know) the ins and outs of train derailments or regulations to prevent them the way a Secretary of Transportation, or a Presidential nominee, could or would.

Harris needs to get up to speed on all the parts of domestic and foreign policy that haven't been her actual portfolio for the last three years. She's still get blamed/credited for all of that, because she's part of the Administration. But that doesn't mean she's actually been dealing with those issues.

Which is one of many reasons why she's not holding a press conference right now. With all the other stuff she's dealing with, she almost certainly doesn't have time just yet to sit down and get prepared for one; and contrary to suggestions here, she hasn't been in the weeds on every aspect of domestic and foreign policy for the last three years.