It depends on how immersive you want your games to be. Just look at sims like DCS. I tried it out, and you literally have to follow a checklist to correctly start up the engine. Like starting the APU, fuel pumps, ignition, etc.
Or same reason people play MilSims, or same reason people want sim racers.
But is that not the entire point of VR? To place you into a completely different reality? We often see videogames in general, as a way of escapism, but VR has taken that a step further. Ya, reloading a gun manually seems stupid, but the feeling of actually dropping a