I believe zombies aren't everywhere because they only spawn near loot points. So, if there is a hut in the woods with possible loot, zombies should show up, too. I think what the developer is trying to do is to introduce 'risk.' Or perhaps the zombies are 'guarding' the loot? However, I do agree with you. The zombies are not much of a challenge anymore. Perhaps if there were more of them (though I've had about 20 chase me before) then it would prove more of a challenge. Then, people might be more convinced to team up to increase their chances of survival in cities and villages, least they be overwhelmed by 30+zombies at once.
