I'm quite sure that there is no one in the world whose job is only and specifically to assist you in being declared un-deceased and that, even if their were, they wouldn't have the authority to entire enact the process. Any person you interact with is going to have additional considerations beyond fulfilling your immediate request and the organization(s) they work with or for also will have additional priorities. How could you possibly expect everyone else to drop all other work to complete your request totally without regard for any of their other priorities?

Because it makes sense for everyone. Making the system perfectly handle an infrequent use case is a waste of resources for the larger system. A manual, buggy process is likely fine. The time spent to make it perfect would be large. That time can be spent making sure people get better service in other, more common scenarios.