I'm sure this isn't something which has completely passed people by, but the old level 60 legendaries unique equipped items also stack with the same item for the post loot 2.0 versions making it possible to wear 2 of the same item without it restricting you. This is specifically true of the Stone of Jordan which I have 2 currently equipped for a high damage vs elites bonus (currently have +25% and +29%)
This may become obsolete after gear gets better because items will become more powerful overall, however if you have one lying around, it will stack and still provides solid bonuses which would warrant their use over other options.
Let's face facts, you're always taking longer to kill elite packs than you do standard ones, right?
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