Not everything is Apples to Apples in hardware and how it's applicable to someone's use, @Cam. Not sure why you're trying to stir a pot. As I recall, that individual with the 3090 was also a VR user, which does change things quite a bit too. Neither here nor there though. Everyone has different monitor resolutions and pixels to drive.
You don't know what rendering settings people choose, and that's a factor in all of this. At the end of the day, I think @dlrk has fine expectations of settings if he's already flying through 3 hours of a flight. Doesn't seem unreasonable. If such is the case, it sounds like he stands to benefit from such an upgrade.