At least the wake from sleep crashes are gone in 10.15.3 on my Hackintosh. Anyhow, drivers still have issues. For some specific cards there still are reports of random crashes or freezes. And it also looks like all cards are still affected by some general instability in certain use cases (FCPX crashes during longer editing sessions, crashes when editing images in Apple Photos). I also still observe graphics glitches in some games like Dirt 4 and Shadow of the Tomb Raider.
I have now mounted my Radeon VII back in and will sell my RX 5700 XT. I bought it just for beta testing but I am sick and tired of it. I have 6 bug reports open with Apple and none of them has got any attention, most of the ugly bugs don't seem to get fixed. So for me just a waste of time to continue beta testing. Apple simply doesn't care. It really looks like all they care about is to get the drivers working "just good enough" for their own products but they simply don't care about third party stuff. I don't get why they even offer eGPU support if they don't care about the drivers at all.
All of this reminds me about the Vega10 (Vega 56 / 64) disaster where it took them well over a year to finally push drivers that are working properly (proper power state switching, fan control, etc...).