Thank you for the quick replies, it's really appreciated. We think the most common issues arise due to the fact that one can connect the Oculus Quest 2 in various ways, there is no single way as far as we can see.
There are really only 2x ways to run AF FS4 with a Q2. You either use Virtual Desktop or you use the Oculus desktop app with either Link or Air Link.
Virtual Desktop is probably the easiest for many who don't want to take the time and effort to learn how to properly setup their Q2 using the Oculus Desktop app and Oculus Debug tool (and maybe also the Oculus Tray Tool). All you need to do is startup VD from your quest home and connect to your PC (need their streamer app installed and active beforehand). You then select SteamVR (which you need to have installed already, but not active). This will take you to the SteamVR void and you can select fs4 from the library panels (don't use the Steam home house option). Everything should startup fine and you can exit by using the fs4 menu. VD also has a number of graphics options that you can play around with to finetune things. Overall, VD works very well, and again, many find it much simpler to use. The main point with VD is that it does require you to run fs4 though SteamVR and because of this, you may lose a little performance.
For me, the best way is to use Link or Air Link because it does not require you to run fs4 through SteamVR. Both startups (Link and Air Link) are basically the same. From the Quest quick menu you select whichever one you want to use. Once you are in the Rift Home void call up the virtual desktop. Then select the Steam shortcut (not steamvr) and this will display your steam library. Select fs4, then play, then pick the oculus runtime option. This will then startup fs4 as normal. Easiest way to exit is use the fs4 menu. If you've properly setup your Q2 beforehand this will give you the best overall performance. Like VD, you can also run it through SteamVR but your performance may suffer a bit. I'd estimate I lose about 10% performance running it though SteamVR and it also does not run as smooth (= odd stutter).
I mainly use Air Link because I have a very good recommended (by both VD and Oculus) router/wifi setup (i gig router ethernet connected to my pc and dedicated 5Ghz wifi within 3-4 m from my play area). If you don't have this than you should use a Link cable.
Anyway, I hope that helps clarify the fs4 startup options using a Q2 (or Q1 and QPro). If anyone needs further clarification please feel free to ask me and I'll do my best to try to help. Cheers.