if you cannot trust 4 people in your life. then maybe they do not deserve to be your beneficiaries
Exactly.
The ultimate goal is to give access. Any system designed to give access can be breached/hacked/abused. So the real question to ask is "Does the system provide a good enough usability-to-security ratio?". For example, writing the password on a sticky note is very "usable" but not very "secure". Still, people do it (for non-critical passwords, hopefully).