You're not confused: it is this script that highlights the selfcons and revcons, but it only does so on higher road types - primary street and above.
I think the discussion is somewhere in this thread, but you're right about it being a long one. I think the reasoning is that it's only worth fixing them for the more "important" roads. I have seen a couple of requests before to highlight all of them, but I think Timbones (the author) doesn't feel it is necessary.
Thanks. My two cents, it is important for all roads, though especially those near important roads. It was actually a mystery to me what problem a Uturn node causes until I accidentally discovered one on the Live map when I wanted the answer to the question "How will waze reverse a users direction at an SPUI where no uturns are allowed?. Well a picture is worth a thousand words so:
I saw this and sure enough there was a Uturn node at Briarthorn and Midland. I don't understand why the uturn node gives the end result and the irony is on a road like Ehrlich you can make a u-turn at most median crosses, but since it is not split, waze won't give that option, something that will hopefully be addressed in the future.