system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do people "let go" and choose to die?

I've heard countless stories of people waiting until family members show up to finally let go, or hearing about a spouse dying while you're both sick and one "lets go" after hearing. I just don't understand how anyone can command their body that way.
gpt
I would add an alternative explanation: the (inopportunely named, in this case...) survivorship bias. 

For every person who died at just the right moment to create a memorable and touching story about how they "hung on" until the right time, there are quite possibly 99 other people who died far too early or much later (or not at all!) to make it story-worthy. We only hear about those rare cases where people die at just the right moment, giving something of an illusion that the people may be exerting control over when they die.

Not to say that's not what is happening, in some cases. But it is important to consider such observational biases which are often a simpler explanation for the stories we perceive.