Earlier quoted context omitted.
It's... complicated. It works, but there's a near-certain chance you'll eventually burn the display through the lenses if you do it wrong. It's the same reason you shouldn't leave any VR headset laying beside a window without a cover. The tracking is fine, but you'll probably end up re-buying a headset on a monthly basis if doing it.
FWIW, I fly FPV and am aware of this issue but haven’t had a problem with it. I probably average about 4-6 hours per week outdoors in sunlight with my Skyzone 04X. It has dual OLED screens and a very similar (if smaller) form factor to my Quest 2. I’d say it’s more a “be aware of this and be careful” problem than a “you’re going to break it once a month” problem.
The Q2 without a non-OEM facial interface isn't exactly tuned as well for outdoor conditions (then again, Facebook just put out a new one) as most FPV hardware is.
By the way, do you know the vendor of the panels in Skyzone hardware? I've been wanting to try some out from a certain vendor for ages, but I can never tell what they're in, just that they're occasionally used in FPV gear that's always discontinued by the time I find out about it. Microdisplays are such a worse market than standard displays (like what's in the Quest 2); it's a real headache.