Anybody still feel a resounding "ehhhh" when they look at the items shown in that Gamescom speech? Sure, the DEEPZ number got bigger, but otherwise they just put yellow dots next to things items can already roll now. Then added another On Kill/Hit effect that, if the last effort at legendary improvement was any indication, will likely be completely useless. Things like Maximus demon+fire chains or the Hellfire Ring fireball didn't scale at all, and so they did flat pathetic damage with a low proc rate. And they weren't interesting in the slightest.
Compare this to the latest Path of Exile unique:
Something that completely changes builds and opens up possibilities that did not exist in the game before. Summoning a Hydra on kill sometimes or something is not what itemization needs. It needs major mechanical risks to be taken on the part of the developers.