I agree with what you says, If you're holding a lot of money (crypto), you shouldn't keep it a secret from your family, especially your parents, spouse or children. In the worst case scenario, even if they aren't interested in learning about Bitcoin or crypto, it's a good idea to leave a piece of paper with your seed phrase for your trusted loved one.
This way, in case you die, they would have access to your funds and could use them instead of the assets being lost forever.
To be honest, anyone could face unexpected death at any time so imo it's really important to share knowledge with your trusted loved ones before it's too late.
In truth, using words to make reference to death might scare alot of folks here and out there, into thinking you are sounding superstitious or fetish.
You aren't off point in your opinion and it is the fact that having at least one person who you trust in this life, be it a friend, family, lawyer, doctor or anyone or even calendar and AI, is more of the education that anyone would need to be aware of such an inheritance of legacy. The next would be an interpreter or lawyer to dicipher what the information left behind means.
How else are lost treasures found? I wonder!