I ask this because I just discovered and filed a bug that apparently outlines all the strokes of a symbol when expanded, given it has been rotated or scaled with the Free Transform Tool. Replicable in Illustrator CC 2015.0 and 2015.3.
Is there reason Illustrator should be outlining the strokes of an expanded symbol rotated via Free Transform but not for those rotated with the Selection Tool? Is there any way to determine with which tool a symbol was rotated? Seems there is some fundamental difference, although possibly not visible to the user.