without bolster, a guy in lvling gear would be killed almost instantly in 55 pvp
in pve, he would just do lvl 50 ops/hm fp etc and gear up without being killed every two seconds.
So bolster is needed in pvp, but not pve.
And if guy with 900 exp was in ranked, he would die horribly; so it helps raiders in pvp about as much as pvp gear helps pvpers in raids. the stuff with 46's is a bug and should be fixed, but isnt the intention of bolster.