I like the idea of keeping each fight's core mechanics intact but I'm not sure I like losing a hypothetical 50% of my damage output (even if it is for illustrative purposes only), this is why I advocate for lowering ilvl syncs down to where the content is balanced.

That said, I do think there is room for performance based loot drops, say if you do well then minions/mounts/music/cards get an increased drop rate. I did find the whole voting at the start of a duty thing entertaining but it'd never work, as soon as the novelty value wears off it'll become a chore and nobody wants chores in their MMO.