If your spouse had a medical emergency, would you know where to find all your important papers?
In many households, there tends to be one spouse who is the "paperwork person"- the one who pays the bills, files the statements, and handles the important documents. This is even more prevalent in the homes of spousal caregivers!
If you are a well spouse, and your ill spouse is unable to handle these duties - who would help you in case of emergency? Some records may be kept at home, others may be stored in a safety deposit box, a bank, or even a lawyer's office. You need an easy checklist someone can access in case of emergency that would tell them where to find your important information, if needed.