Why were zombies never present in Skyrim?

I'm playing through on a new character and just wondering why Bethesda never put zombies in the game? I've slaughtered countless Draugr and skeletons they possess no threat or never made me jump off my sofa they're just so boring. I'm in Kilkreath Temple doing the quest for Meridia and seeing all these horribly mutilated squished corpses on the temple floor I'm thinking "**** those things are creepy wouldn't like to see one shambling down the corridor, hungry for my delicious Imperial flesh". So what the hell why no scary squishy zombies? And no answers saying "The Draugr are zombies" No they are not the desecrated corpses in Kilkreath are more decomposed than those sorry excuse for undead.