Lets not talk about DCS, this is a bad example, as fallout 4 vr. Its just not right to take a game that doesnt works well and say "Current GPU's are not ready for Pimax, because there is an unoptimized game that doesnt runs well".
There are many games to test that runs just well and offers better graphics. Something that doesnt works well on 1080ti wont work great with 2080ti, imho,
Elite dangerous requires just more tweaking;)