No wonder in myths and superstitions that people have to leave their past life behind in order to move on to the afterlife... Because otherwise the emotional and mental burdens would have been brought to the next life and if there were painful and violent experiences in the past life, I could imagine the scars, traumas, resentments and fears would follow and the next life would be negatively affected as well... Even if it's not horrible past experiences, just being unable to let go of the past life with good memories would affect how you're able to enjoy the next life as well (which Hinata kinda learnt about that already in the chp 11), similarly like how people can't get into a new relationship and commit to it healthily without letting go their exes.