Documents, of any type, must be as clear in meaning as possible. The purpose of a document is to convey information to the reader and if the reader is confused by what is written, the document has not served its purpose. This holds true for academic work or documents written for business reasons.
A document that is unclear could have dramatic consequences. For example:
Clarity of information is one reason why pronouns (we, you, they, it) are not used in business documents. For example, parties to a lease contract are named continually as either the "lessor" or the "lessee" and not "us" and "you". A document that discusses safety procedures will refer to particular procedures by a name "shut-down" procedure or "wash up" procedures and never simply refer to the procedure as "it".
The writer of a workplace/business documents must not take anything for granted and should take steps to ensure that what is written is as clear as possible.