>>274463985
Actually I think it's more about showing less in my regard. I'll be more immersed in night ops in Onward, and I know I'd enjoy greatly those Boneworks bits where you carry a flashlight and a handgun in a dark corridor. On Vive, if the whole scene was black, it was easy to completely ignore SDE and I almost sensed cold and space around me, bigger than my room.
With Index, despite visual clarity, there's too many dealbreakers for true immersion. Black levels are shot, contrast is weird, I feel like there's a blue tint all the time, glare is about as immersive as getting a real kick in the nuts. Audio is better, but it doesn't cancel noise, I can hear my PC, hear my controllers squeaking, it's like I always have a chaperone on I can 'hear'.
Alcohol doesn't help if my eyes are tricking me - and VRChat for example very rarely passes the test due to jankiness, models spazzing out, people with FBT hovering in mid-air. However FBT dancing with a anime chick towering above me when most of my vision was her navel, I was often immersed enough to feel "warmth" on my cheeks. 
When I think about truly immersive experiences I think I need a Sensory Deprivation Tank with a wireless VR headset with IPS panels that doesn't exist yet inside.