Code reuse is an advantage I guess. For example you want fast responsive validations as the user enters data, but for security reasons you need to do final vali

Code reuse is an advantage I guess. For example you want fast responsive validations as the user enters data, but for security reasons you need to do final validations on the server. You have objects on the client that you want to persist to the server but you don't want to have to write two models.