The author may request the right to re-publish the article in any other publication if - for example - the author is planning to write a textbook and wishes to include the text of the journal article, perhaps as one chapter within the book. This right may not harm the publisher's interests but due acknowledgement should be made and the same copyright conditions should apply to the textbook as those applicable to the journal article.
The flexibility of modern word-processing software enables the author to re-model text for different purposes, for example to 'cut and paste' a few paragraphs from a journal article written to include in a consultancy report. Or the author may wish to develop the arguments he/she has written in a journal article and write a textbook on the same topic.
A publisher will normally accede to any reasonable request for re-use, but the author may wish to retain the right to reuse the content of the article or create new works based upon the published content (make derivative works) to act quickly without seeking the publisher's permission. However, if the author does retain this right, it would be courteous to inform the publisher of any published reuse of the original text.
Provisions about reuse by a publisher can be found at: Publisher > Future reuse