Just got a small update for FS4 on Steam today. Doesn't seem to make any difference (plus no update notes btw) with Vulcan. I just tried night flying around LA International airport in VR with my Quest Pro and the night the visuals are still terrible (lots of artifacts). Shifted to daytime and all's well. This is with the latest nvidia 537.34 driver (same as with previous 537.13 and I always use DDU in safe mode to uninstall previous drivers beforehand. Also latest win1 updates and SteamVR latest 1.27 beta. I do kinda think that FS4 isn't getting the attention it deserves.
Again, not a big deal for me since I still mainly use FS2 most of the time anyway, for better global coverage (esp Chicago and Hawaii with user scenery). Only things I like better with FS4 is quicker startups and landing lights in VR, lol! Also, with my PC upgrade earlier this year (i913900k/rtx4090) msfs is now looking and working pretty good in VR, lol! Aerofly FS4 is going to have to lift its game pretty soon or become redundant imho.
BTW, their RC simulator rc8 and rc9 (I have both) are still the very best ones out there right now, esp. in VR with their 4D flying fields. I still find that these work best with OpenGL rather than Vulcan, for some reason?