Multiplayer and/or social features could really make things interesting.
VR sim flying is spectacular, but a pretty lonely thing. If people could enjoy some nice views together and even cooperate in the same cockpit that would be a completely unique experience.
I think for something like this to really be comfortable online/network multiplayer would be by far the most practical thing. AFS2 certainly seems to be better fit than most other sims for something like that, it has the best performance and VR controls and it doesn't need endless loading times and tweaking to start a flight. Of course it could well be that this is all not really feasible with the current code or way too far down on the priority list considering the effort that would be needed.