When testing the latest Syllabus, the accordion was really finicky for me about being able to drag and drop or collapse. 90% of the time when I wanted it to collapse/expand it would drag and drop instead and I couldn't get it to expand. It seems like you have to be VERY still and not move the mouse or it starts up the draggable.
The entire h2 bar is by default draggable. I feel like it would be an improvement to just anchor the drag part to the icon rather than the whole bar.