However, there are trustless ways to pass bitcoin in to your heirs, such as a timelocked transaction. I set it for a year in the future and give it to my heir. If I'm still alive in 11 months, I invalidate it by moving one of the inputs and then replace it with a new timelocked transaction.
I feel this option is better than informing and giving the supposed heir the encrypted seed phrase when the bequeather is still alive. It's a safer option.
It's disappointing because sometimes people we trust can be greedy even when we least expect it. Money can trigger a lot of things in people.