You seem to have it worse than me, for sure.

Could you test if you can reproduce the Black Screen of Death also in "The Jade Stoa", if you can get into it via undersized party.

If I get into that particular instance and have a couple Browser Tabs open - or even dare to stream it via Twitch/Discord - I get 100% of the time a BSOD. On the the other hand, if I dont have anything open it's very stable.
That is the most reproducible black screen instance I found in FFXIV. Other than that I have the BSOD only in Delubrum Reginae at Boss 3, when one of the robots spawns the gravitational bombs. Do you have these issue there as well perhaps?

Have a great day. I hope one day we get more help at some point. So far, I searched the entire forum and most people weren't able to fix it or did something very random/switched their entire pc.

Like you, my PC runs every other game/software perfectly fine and stable.

Currently I'm even afraid to launch FFXIV, because I running into such an issue is very frustrating and draining.