I write software for a living, an exception in software means something unexpected, out of the ordinary, it's treated as a "special case".

In a lifetime, death is not unexpected, it's expected, even guaranteed. The only variable is time, but that's true for many aspects of life.

Take for instance moving house, it's got a high likelihood of happening during a lifetime, multiple times. There's processes to update your address, tell your bank, the utility company, insurance, etc. There's address change services, some even run by government that all but automate this.

Why is it that such a thing doesn't exist for death?

The absurd amount of effort that family members after a death need to get through to deal with things like this is insane.