This configuration is recommended to every person who intensively uses their email account with a client software (which means they do not check the email via WWW using the so-called WebMail) and appreciate security and confidentiality of their correspondence.
The email via WWW is recommended for the users who do not use their accounts too often, need to check the email on a random computer, or are uninterested in taking time to configure an email client. An additional benefit of using the email via www is the fact that all data, e.g. the correspondence history, address book and so on, are stored on an internet server, which takes care of their security.