Wht are disadvantage of business letters?

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Formal structure: Some rules must be followed in drafting a letter. To follow the rules is a limitation of the business letter, because experience is necessary of the letter, as experience is necessary to write it.
Old media: Business letter is an old written means of communication. But there are many modern forms of written communication.
Complex language: Sometimes business letter is written in complex language for lacking of sense. If it occurs, business letter becomes meaningless.
Missing: Business letters may be missed. But it is impossible for E-mail, fax, telephone etc.
Taking time: In this modern era of communication, letter is considered as a slow-moving tool of communication. It takes more time than any other form of communication. But modern devices take no time to send written document such as e-mail, fax etc.
Secrecy: Sometimes business letter fails to maintain business secrecy.
Costly: In comparison to another form of the communication business3 letter is costly.
No immediate response: There is no immediate feedback in business letter.