While the exact logic TF2 uses leaves a lot to be improved, you absolutely need this kind of lag compensation. Without rewinding any amount of latency results i

While the exact logic TF2 uses leaves a lot to be improved, you absolutely need this kind of lag compensation. Without rewinding any amount of latency results in having to aim where an enemy gamer will be by the time your packet reaches the server instead of where they are on your screen. If you remember before they patched the Pyro class you had to aim significantly in front of players because the flames weren't lag-compentated.