You can still be interrupted by stuns as an ogre, you just don't get stunned. Try it, stand against a wall, and if a monster bashes you while casting, it will have a chance of interrupting the spell you're on, even though you don't move, or are pushed.
Additionally, its also about optimization. A mob only bashes what, every 52 seconds when slowed? Not worth the loss in regen or snare neck.
Troll all the way
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