I don't see the distinction between paying my debts in advance of my death, versus establishing in my will that my debts will be repaid from my remaining assets

I don't see the distinction between paying my debts in advance of my death, versus establishing in my will that my debts will be repaid from my remaining assets. Nor do I see a major moral distinction between, say, setting off a nuclear bomb timed to explode one microsecond after your death, versus one microsecond before it.