A final wishes planner is a single document that records what you want to happen after you die, and where your family can find what they'll need.
It is not a will. A will decides who receives your property, and it has to follow your state's legal rules. A final wishes planner covers everything a will doesn't: the funeral you'd prefer, the people who should be called, the accounts that need closing, the passwords nobody else knows.
Most families discover the gap at the worst time. The will handles the house. Nobody knows whether Dad wanted to be buried or cremated, which of his three bank accounts the mortgage comes out of, or the name of his life insurance company.
That's what this planner is for.