There are a few things that don’t make sense in VR.
Auto exposure and lens flares are two of them.
A lens flare only makes sense when you are looking true a camera. And in VR you are supposed to look true your eyes not true a camera or monitor,
The same kind of idea with Auto Exposure. When you are wearing the headset and it gets bright your eyes are already adjusting. So adding an extra layer on top of it makes it less natural.