Yes, they do seem pretty rare these days. About the only legacy (UA/AA/DL) ones I can find right now are DL and UA flights to/from PVG which currently have stops in ICN to avoid China quarantine requirements. Flights which have same flight number for outbound and return are not really direct flights. You will earn mileage credit in both directions on these, while direct flights earn mileage based on great circle distance and only count as one segment credit. They are also taxed like a single segment.