It’s cool because reincarnation turning out to be true would mean that humans are more than just bags of meat being controlled by electrical signals via the central nervous system. If you die and part of you reappears as another being, clearly something about a person can exist beyond the physical brain. That would be a HUGE paradigm shift.

Also a lot of people who believe in reincarnation believe that good karma vs bad karma affects what you come back as. That would give life meaning and give people an incentive to be good.