The speed at which zombies move would largely impact our survival rate, possibly more so than any other factor. Make it to round 53 in Nazi zombies and tell me I’m wrong lol! If they can spend money researching a fictional creature, I can use the same fiction to come to my own conclusion on the fictional subject.
Reminds me of the Reddit thread where they said the perfect weapon in a zombie apocalypse is the light saber - never needs reloading, never goes dull, relatively quiet, can be used to amputate limbs with bites, cauterizes the zombie to minimize spread of the disease while dispatching them, can be used to start fires and cut through walls as required.
Someone said “you can’t use a fictional weapon in this!”
Answer: you’re using one fictional situation, I’m pulling from another.