Most people don't stick their wills to their monitors with post-its (there are other secrets in there after all, and many people would like to know those); the legal system has mature tools that are surprisingly good at keeping such secrets secret until the release conditions are met. A will is a Solved Problem, with highly reliable solutions - consider the ways to prove that it is indeed to be opened. Contrast with most computerized solutions and "solutions" thereof, mostly hinging on some form of dead man's switch.
Most people don't stick their wills to their monitors with post-its (there are other secrets in there after all, and many people would like to know those); the legal system has mature tools that are surprisingly good at keeping such secrets secret until the release conditions are met. A will is a Solved Problem, with highly reliable solutions - consider the ways to prove that it is indeed to be opened. Contrast with most computerized solutions and "solutions" thereof, mostly hinging on some form of dead man's switch.