>>718763917
The answer is "Jedi don't obsessively cling on to life and let things flow as they may so they are "weaker" in life but after death they manage to keep on going as Force Ghosts. Meanwhile Siths are the oppossite, they have nothing after death so they hold on to life beyond what's normal, using the Dark Side to fuel their bodies to limits beyond human imagination". Vader survived being burnt alive in Mustafar, Maul survived being cut in half, Sion survived being a walking rotting corpse for decades.