It was probably one of the best edges there was.
Besides the whole occasional vision aspects of room/player and inventory/weapon pick up, you got a lot more out of it.
It enabled the following perks:
1) Blinded by a mob you want gear from, you can still sac the corpse so it doesn't decay. Huge for keys as well. Getting eyejabbed by an NPC in Organia when it was convulsing, and it dies before you can get off a serenade to calm it.
2) Dirt disarm- you get dirted- you can still attempt disarm. You may have to spam til the check is made that you see the weapon.
3) You can utilize your prep bag while blind (Easier with another char) by dropping it so they can get a cure blindness prep out.
You could also put a floating chest in a floating chest- so you keep a back up, drop, sac chest, contents spill out, get potion, quaff, get all, put in secondary chest.