There will be strong opinions on this one. X-Plane keeps that data, but the link just happen to be broken today. It was up around 20% of all hours are VR last time I looked literally a year ago. That’s probably going up as stronger graphics cards and headset options (for the money) are hitting the market.
The important part is (IMHO) those that use VR typically fly exclusively in VR. Life happens in VR. Once you go VR in flight sims, you can’t see it any other way. As a 30+ year IRL pilot and I’ve flown sims since the Sub-Logic days on Apple II’s, I now -ONLY- fly VR.
So if my 3 favorite flight sims (intentionally listed in no particular order) are FS2020, DCS and X-Plane, two of those have spent a LOT of time getting VR nearly as good as it can get (subject to video hardware and “hand” controller evolution). FS2020 will have a massive strategic advantage over the others with its cloud based photo-orthograpy, navi-data, real-time flight info and weather, and frankly decades of community development base… once it gets it gets VR baseline up to snuff. That leaves XP with just its way superior flight model physics engine (and FAA certified business), and DCS its multi-user combat role (game) as their primary advantages.
That’s why VR is important… Cheers!