@Obrimos.
The ability is the effect. An aility is simply a name. How is Kick and Pummel different? Different abilities same basic effect.
When dealing with a video game the numbers are everything. If we play the same but have different look then the mechanics have become homgenized. At a certain point it will make the same difference as the gender of your toon.
We have a shield wall now. It is essentially the same as the warriors now except it doesn't prevent as much damage.
Look at the 4 healing classes. All of them play very much differently but are for the most part equal. There are some complaints but Blizzard is not trying to make them identical. Priests don't have the same mechanics as druids as shamans and as pallys.
Do Warlocks and Hunters fulfil the same roles? yes. Do they have the same abilities? No! Hunters work off of completely different mechanics. Same role. Different stats.
Hunters and Rogues have the same stats. Different roles.
See what I am getting at here?
How are Pally tanks and Warrior tank different in Beta except for obvious name and animation differences? ATM the don't think a pally tanking guide and a warrior tanking guide would be all that much different.
Also, I think you are mistaken in thinking certain mechanics are needed to be able to tank. Shield Wall is not needed to tank. No more than an AOE heal or a HoT is Needed to be able to heal. Or That a DPS classes needs a CC ability, AOE attack or an interrupt.
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