Pictures this when you are running with friends or alts, which is, I think, the main reason this content is being developed.
Can you imagine? Running around Stratholme Dual-Wielding Sulfuras and Shadowmourne while wearing the legendary cloak.
Not only legendaries, but cool weapons that have insane procs like Gurkthalak and the sets that grants your favorite set bonuses.
All while choosing your favorites enchants among all of them.
This amount of customization will bring some new life to the game all around.