Do you use the same password over and over because it’s too difficult to remember multiple passwords? If you do, then all you need is one website to be hacked to put your information at risk, and you would need to change your password everywhere.
Or … are your passwords scribbled on a piece of paper, tucked in a drawer—where you don’t have access if you’re away. You could lose the password information if you spill coffee on the paper, or your dog chews it, or you simply misplace the paper. It is also a risk that someone with access to your house can find that paper.