In many games you are given the option to restart when messing up or if you are stuck and know you are about to die and have to restart anyways. Restarting is a very fast option to not waste time. In ffxiv, this is not an option. I have been in situations where the boss is just standing there, everyone else is dead, and no way to finish myself off to save time.
Vote wipe would work like this: One person is alive. They cannot die. Or maybe they refuse to die and their kit lacks any resources to revive people and/or bring the fight back to a managable level. There may be other aplicable situations.
Vote wipe would work like other party voting systems such as vote abandon and vote kick. Except unlike vote kick vote wipe can be done mid-battle.
I'm surprised this game lacks this feature.