The 50% drop in potency of Protect and StoneSkin for WHM begs to differ with you on that score. Cutting the potency or effectiveness of those two skills more than qualifies as a nerf.
You know, I had written this long post trying to discuss the power healing and potency of various skills, but then I realized that isn't the main issue here. The OP is talking about lost identity, and most of the replies countering the OP are talking about numbers, and intricacies of skill sets, raid utility and that's not really the point.
To me the point is this (and I am not addressing raid content);
WHM has lost it's identity as the stoic power healer with strong protective abilities. The two primary protective abilities are available to several other jobs and the WHM lost almost 50% of the potency of the moves meaning everyone else can cast them as well as the WHM. In most (all?) non raid settings, AST and SCH are more than sufficient for the task at hand, none of the healers really have any issue in non raid content. So what is there about WHM that makes them stand out in normal play?
The loss of identity is actually pretty clear. Losing both Granite Skin and ProShell stripped two aspects of what made WHM different in regular content. In that kind of content, the AST has their globe and Deck O'Wonder, and the Scholar has their Faeries, WHM has a big stick. No pet, no cards and really no 'hook'. I don't really understand why people think that it's acceptable, or should be, for CNJ/WHM to lose the Granite Skin and Proshell traits, when those have been core abilities for WHM & CNJ throughout ARR.
In pre 50 content, one of the hooks for CNJ/WHM and THM/BLM was the option to pick up a physical shield, but when the only 1H weapons for WHM at level 50+ cap out at ilvl 100, and there are no shields even remotely close to that ilvl, the hook of a caster with additional survivability is gone.
When I look at it as I move into HW content as WHM, I can't use a wand/shield combination, Granite Skin and Proshell are gone, and the other two healers can keep up in any normal content, in addition to having their uniqueness and hook intact. It makes me a sad neko.
I don't care about the theorycrafted power heals fo WHM vs the others, I don't care about raid utility. I just want to play Paladin and White Mage, and have fun. Give me my bloody shield back and I'll stop worrying so much about the loss of Granite Skin and Proshell because the shield will (should) provide me with better survivability that the other healers.
I'd say the same for giving the shield back to BLM/THM as well, I think it was a great option for CNJ/THM and BLM/WHM to be able to use a 1H weapon and shield exchanging some weapon potency for useful defense. I guess that would be too much like horizontal progression though, so it's unlikely to happen....in which case, restore the traits Granite Skin and ProShell. Except, I know that won't happen either. Oh, the sad neko face is back...
Except how many 1h weapons are there at ilvl105+? None. WHM can't use a physical shield any more than SCH or AST can once you get past level 49. There is zero point even talking about shield use by WHM (or BLM) unless SE makes some one handed weapons and shields with ilvl in the same ranges as the rest of the new gear.
Except that really doesn't address the loss of identity, that addresses the relative power and utility of each job in a raid. What the OP is (I think) talking about, and so many are missing, is that the identity is like the flavor of food, and WHM has lost some of that flavor.
Let's say you can choose between a great Steak, incredible BBQ or a melt in your mouth Tandoori Chicken. Each of these dishes will sustain your body in almost the same manner, but each is unique and has it's own flavor. Now imagine that the steak was not flame grilled, just grilled on a flat-top and was no longer seasoned with as much salt and pepper when grilling. Now the Steak has lost a lot of it's flavor.
It's about the loss of the uniqueness and identity, the flavor that the job had has been diluted.