Having your parents create a “death book?”

Has anyone done this? Mine are currently in good health but I know that can change in an instant.

I know their wishes are both to not be kept on any sort of life support. And that they want to be cremated. And neither of them want funerals or memorial services.

I know what Google says but what have your real life experiences been? Have you gotten any opposition to this from your folks?

(I'm not too worried about the financials, I already have copies of all of it. It's more the emotional stuff.)