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I've come across several edits by >2000 users which contain no edit summary (just the automatically inserted "deleted xx characters in body").

Should I assume that edit summaries are not regarded useful when the edits don't need to be approved?

This question and its answers/comments seem to imply otherwise.

I've come across several edits by >2000 users which contain no edit summary (just the automatically inserted "deleted xx characters in body").

Should I assume that edit summaries are not regarded useful when the edits don't need to be approved?

This question and its answers/comments seem to imply otherwise.