As a dedicated zombies person, i have been playing zombies alongside multiplayer for about 4-5 years now and i have discovered something: We are losing sight of what the perk a Cola's were originally. I justify this by using the names of the perks from world at War for example: Quick revive Soda: it sounds like a soft drink that you would likely buy from a store/vending machine, and now i compare it to a perk from modern times: PHD Flopper. Sure, it goes with its name, but it doesn't even sound closely related to a soft drink at all unlike the 4 original perks.
I hope you understand this like i do
Cheers
J.N