Because it adds a few attributes (like 'password') and methods (like 'authenticate') to your model, and you might not really want such things on every one of yo

Because it adds a few attributes (like 'password') and methods (like 'authenticate') to your model, and you might not really want such things on every one of your models. Clarification: has_secure_password does NOT mean you choose between secure or non-secure password, it just mean "I want a password on this model, and better make it secure guys!"