Well, it is kind of hard but possible. Take for instance a non earth stance rogue.
+30 sheltering +21 Divine ETRs +9 PDK PL +30 Blitz +15 Artifact (Sireth + Planar focus)
That's 105 without armor (light) and 105+22 light armor with BAB20 = 127.
Now with a simple 25 sheltering, without the PLs you are down to 92. Remove blitz for those moments when it is hard to keep it up and you are left with a very shaky PRR.
Honestly it is not to the level of the barb crushing content. Even top geared you will be likely to die more often since you basically have no passive healing and the HPs are lower. Mitigation is similar PRR wise (better for rogue overall) but the passive on kill healing effectively extends a lot the life of the barb.