Rogues are not any closer than they used to be in terms of armor, that point is moot. If you compare armor sums (body and helmet) from previous expansions you will see that if anything, the new L46 mythic set is perfectly in line with the L36 mythic set in terms of warrior-rogue armor difference (19-21% less armor for rogue).
The only thing that can be blamed for the unequal survivability growth is the all-class items (Planar Pendant, Arcane Ring). So yeah, 170 armor is less of an increase for warriors, more for rogues and even more for mages. Plus both items offer stats in the form of equal INT, DEX, STR which due to the stat distribution system gives an overall smaller survivability bonus for warriors in terms of HP. In return, they get more out of % armor buffs and also heal from STR skill buffs (which are not scaled <- that is what you should be focusing on).
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