I'm guessing they don't know what -PDT or -MDT sets macros are for... I'm guessing you're referencing Oddwaffle's post with your numbers notice how the MNK is taking 600-800 while the WHM takes half that? Should bring up some red flags that lead to questions such as:
1) Is Countersance up?
2) Is the MNK in any -PDT gear?
3) Is the WHM in -PDT gear?
Yeah DEF matters a bit more now than it did before the update but it still matters less than proper gear swapping into PDT/MDT sets.
There's no such thing as crap players... (Sarcasm if you can't tell) Can I get to the hate cap as a healer faster? Sure, doesn't mean I get there and stay there much of the time. Don't get me wrong if I screw up or the mob decides to be an asshole with certain TP moves over others I can end up dead more often but that's generally on longer fights or when we're unprepared for stuff.
Who can do math? If you can then go look up FFXI Enmity table. When you compare the damage numbers remember to reduce that total by 70%. What you'll find is that dealing damage is still the best way to keep hate. Sure Provoke and Flash got a boost as quick ways to get closer to the cap at the start of the fight or after hate reset but they're still just as useless as they were before when trying to stay at the top of the hate list when compared to damage dealing.
The only reason a PLD will take notably less damage than a DD is because of the shield they're using, Ochain's near capped block rate or Aegis allowing for -85% MDT. The thing is that still doesn't address the issue of how dealing damage is still the best way to keep hate.