I think it would be useful if Spreadsheet editor can keep the original text delimiters and separators of CSV documents. It is a related to this question: http://ask.libreoffice.org/en/question/23332/csv-files-lose-formatting-after-save/ People use CSV files to import/export records from different apps and hardware. These tools often do not prepared to handle different kind of formatting. I know it is possible with additional "Save As" steps but it is not user-friendly.
I agree that the default should be to keep the same field and text delimiters. If the user wants to change then it should be his/hers *option*, not a software decision.
*** Bug 71376 has been marked as a duplicate of this bug. ***
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