Some ideas

[cobalt pollen]

Day/night cycles
procedurally generated arenas for cqb and open maps
dynamic weather
weighted triggers
realistic weight system
seemless loading
optimize your game. could use foviated rendering
More player models like plated, light and standard just for player customisation

[fiery mortar]

Weighted triggers?

How would that work it's not like vr's have a harder or lighter trigger pull (except for the psvr2)