Actually, I indeed meant exactly that a dark aircraft on a bright sky is still a dark spot on a lower resolution headset. In both cases, especially when supersampling is used, subpixel features will be visible. Yes, the aircraft will be visible at longer range on the higher resolution headset maybe say 25% for every 50% increase in linear resolution, but this is incomparable to the impact on eyestrain, readability, RGB artifacts, etc.
In racing simulations, I absolutely agree. Higher resolution drastically improves imersion. Not just in racing, but also formation flying, air to air refueling (in fact I am partial to details in aircraft more than cars). Just looking over at your own wings, and seeing the variations in the paint and control surfaces without jagged edges is phenomenal for the immersion of feeling like you are flying ‘the real thing.’ IIRC, I pointed that out rather often at CES and the roadshow.
LODs are not a problem. Only in rare cases do objects noticeably drop off in detail with distance significantly faster than imposed by resolution of the 8kX or even human vision. I consider these cases bugs. And I suspect these bugs exclusively occur with games that were developed with custom graphics engines.
My take on the refresh rate issue is one of luxury vs necessity.
Resolution is a necessity. Being actually able to see something I am staring at has to happen first to make anything else worthwhile.
Refresh rate may improve immersion for some. This is nice, but 75Hz or so is enough for me not to notice if I don’t want to. For seated apps, instead of roomscale, even lower refresh rates are fine.
At the end of the day, you have to decide what matters most to you. Smooth experience, or seeing details and quick readability.
As for the resolution of the Reverb, I suspect it is intermediate between the 8kX and 8k+/upscaler. But I find the remarks by @vrgamerdude a bit confusing, and I would really like to actually try the Reverb.
I might consider asking to borrow a Reverb for this. But this is not the best time for such things…