I've not had any black screens with my 5700 vanilla, but I've had two issues, one is specific to Apex Legends, and the other I think has to do with running dual screens.
With the former, on a variety of pre-2020 drivers (I'm on 20.1.3 now), I would constantly get this DXGI device hung crash where within about 5-10 minutes into a game, my framerate would dip to like 5fps and then the game would crash, in addition to the Radeon Software application. This didn't happen with my RX580 using the exact same driver set at the time. It was so bad it was happening every 2-3 games, to the point where I tried everything, including every version of driver within the past 3 months available at the time, and anything I could find online, to no avail. I stopped playing for a couple months.
Either a patch update to the game (Devs are aware of the issue, which impacts both AMD/Nvidia) or the newer 20.1.3 mostly fixed the issue. It still sometimes happens once out of every 20-30 games. Now, however, I can close Radeon Software, and it won't occur at all. It's odd because I have all monitoring and Radeon overlay stuff turned off, so not sure what's going on there. I don't bother to turn it off unless I get a DXGI crash, but at least now things are very playable.
With the latter issue, what's happening is that I run steam/discord on my secondary monitor and game with my primary. However, if someone sends me a message on either platform, it's almost as if the Radeon Software/driver starts to think as if where I'm getting pinged on is now my primary display, because my framerate in games will drop to less than half. I'll be playing Apex or CS:GO (or anything, really), get a ping, and my fps goes from 100 to 30. I'll have to pause in a corner, mouse over, acknowledge the ping and minimize it. Framerate goes back to normal. This one doesn't bother me much because I can get around it, but it's just odd.
Other than that...running two displays, one with freesync, one without, with a 5700 vanilla...it's not been bad. I'm chalking this up to new architecture. On the whole things mostly run pretty smooth and issue free.