From the point of view of Balance RNG is nice because rewards and Punishes can feel random.The only problem is that RNG can have a huge influence.
1: If RNG touches important core items like "Player die by RNG" it feels really really anoying (mostly for Death is death player)
For this reason some things never should be RNG based
like:
* Do your Vehicle work
* Do your weapon work
* Will a First aid kit heal you.
2: There are really player that life on the "Dark side" of the "normal curve"
Means a few player (under 5%) have so much bad luck they never loot nice items.
And in this cases a game need a reliable guaranteed Basevalue that is immune to RNG