Can't speak for anyone else, but I never liked those briefings and never changed my mind about them. Trump spent much of the time contradicting his own experts and appeared to be using the briefings as a substitute for his campaign rallies. About all those briefings did for me was put me in a perpetual state of confusion and I don't need anyone else to get me confused. I can be confused all by myself. 
I get the sense that the guy has no idea what he's doing, and he's letting Fauci the germaphobe dictate the narrative, even though it runs totally counter to what his goals are.
The press briefings in this day and age accomplish little. The data and numbers, we can get online. But what we are lacking from the federal government are solutions that work to get us back to a functioning society. Europe is paying dearly for embracing the hard lockdown, and it has done virtually nothing to stop Latin America, India and Russia from getting major outbreaks. But what have we offered in return?
You have a President who goes out there and delusionally, repeatedly, keeps acting like this virus will disappear on its own. If it was going to do that, it would've done that by now! You have states that embraced the hard lockdown... some of which, like New York, turned things around after a disastrous start, while others like California failed to get any real results. You have states that resisted the hard lockdown. Most were fairly successful until Memorial Day, and then all of a sudden things started spiking... and then there are states like South Dakota that managed to avoid anything substantial at all.
You have a surgeon general that openly misled people about masks solely so that they could ration them for medical personnel and expose the rest of the public, and only after people started making them at home did they admit masks could be useful... which prompted desperate governors and corporate chains to start mandating them. Of course, that early effort has now fueled anti-maskism that has run rampant on this board and elsewhere. Across the board, the federal government's response to this virus has been a disaster.
The President has brought nothing of value to this discussion. If Joe Biden wins in November, Trump's inability to grasp this problem and devise a viable plan to get us out of it will be one of the biggest reasons why. (Not that Biden, or whatever woke SJW type ends up succeeding him, is going to be much better in that regard.)