NVG is pointless?

On default yeah they kinda have night vision. There are mods like realism and some ai mods you could look into that actually lower their perception at night a bit more.

I highly recommend getting the no bush and no AI (Fenix) mods. PMCs and scavs won't laser you through five layers of shrubbery and instaspot you from 200 meters anymore. SAIN also has fantastic mods that modify bot behaviour to more acceptable levels. And it does NOT make them easier. Once they spot you, they can still wreck your shit HARD. It just takes off the edge of unfairness they often have.