I actually knew about this issue when developing the beta.
I see it as a lose for the player. They aren't killing as many zombies as they could (so they lose out on points) and the zombies remaining still have to be eliminated upon respawn.
Sure, you don't have to be alive during the timer, but then you are basically not playing the game and just waiting for no pay off.
This is also why player zombies became a thing, to avoid other players never respawning.