Why split up duskblade's passive?

Why was the ward clearing passive on dusk blade split up? I can't find a reason on surrender@20 or any kind of context for messing with this passive. It feels really clunky to be forced into buying 2 items just to clear as a n assassin. It's not going to make anyone rush umbral blade 2nd. Umbral blade isn't even a real item. I don't think anyone is going to buy just because it stole dusk blades passive. Why not make umbral blade the wave clear lethality item? What happened to a hydra lethality build?
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