Currently I don’t see how it would really add that much. Occasionally it’d be awesome to have to decide to either attack the zombie infront of me or look to see what that noise was, but overall it’d be just annoying 99.9% of the time I’d say.
It’d be great for sneaking past zombies, but tracking a whole hordes LOS seems a huge amount of effort. For stealth options I think a stealth skill would be a better option gameplay wise.