Says it all here. Reasons why:
- Will help executions, preventing people from running back to their death spot and start yelling in all caps about how they were resurrected
- Will help make deaths actually scary, instead of people getting killed in a battle and then returning in the next minute or so
- Will enable the use of invisible, yet limited players, thus letting players actually act as assassins by being a ghost, sneaking into the enemy base, etc.
- Will require effort from other players to help revive your essence