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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: write-region bug ?
Date: Sun, 05 Jan 2020 17:20:06 +0200
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> From: Jean-Christophe Helary <jean.christophe.helary@traduction-libre.org>
> Date: Sun, 5 Jan 2020 14:14:29 +0900
> 
> *** If VISIT is t, the buffer is marked as visiting FILENAME. ***
> 
> 
> So, practically speaking, the START string is output to the file, and then, the buffer is "marked as visiting FILENAME" which practically speaking means that it overwrites the START string.
> 
> What is that for ?

Sorry, I don't understand the question.  You could ask the same
question about any optional feature of any Emacs API.  And the answer
will be the same: for those applications that need this optional
feature.