I've read the posts rocket made on the subject. For me, that doesn't remove the subject as a point for debate. If you don't want to debate it, stop clicking on threads entitled "make zombies zombies". So far, I haven't seen anyone make a case for 'infected' being better, only them being there. Starting your game design from a point of massive compromise isn't a good foundation. Neither is stating that you "WILL NOT" consider any alternatives to a decision. Right now, this feels like a massive compromise. It doesn't fit with the survivalism fantasy, and making fast zombies just means they're hard to shoot, and melee becomes a battle of attrition - neither of which are actually very fun. If rocket starts with a compromised engine and environment and then just makes further compromises from there, exactly at what point do you think a great game is suddenly going to emerge from it? I don't entirely agree that slow zombies require hundreds of them to become a threat. That is balanced against a single touch being potentially fatal, so going into any confined space should be scary. If fast zombies was the gameplay experience he'd always wanted to create, then fair enough. This doesn't sound like that's the case though. There's clearly a huge amount of interest in this project right now. If the engine can't currently do what's required to fulfill the vision, that would not be impossible to change.