I just said it had to do with pk, nothing to do with mobs and areas.
Fired weapons and Missile Shield.
To be honest, thats utter crap. That would be without sanc and protection (if applicable) and in that case without sanc and hitting a vuln your normal hits can do that damage easily (aka soulblight in the hands of a warrior/blademaster against an ogre. or any fire weapon vs a feral.)
I very recently took MANGLES through sanc and protection on a fire giant. It's not crap. Without sanc especially on a vuln OBLIT is common. As you said, easily fixed with a scroll which is why I don't complain about it all the time. I don't play rangers very often so I haven't seen the otherside to make a viable complaint. With that being said I think that is why people get all fussy about ranger archers. They can also hit your vuln and have other neat affects. I still think tracker is superior but as I said I don't play a lot of rangers.