Most interrupts from mob melee is not from stuns. It's from push. Try standing in a corner some time and notice how very rarely you get interrupted.
I can't imagine anything in-game that can *only* be killed by Ogres. Will some things be a tad easier because of the non-possibility of stun interrupts? Sure, but most of the time, it won't matter at all, or the barbarian has to *gasp* recast some spell.
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