I wouldn’t call the Super Famicom and N64 ports unused or put them on a list surrounded by unused ports even with context. They weren’t widely used, but it wasn’t for lack of ambition on their part and SatellaView did decently enough in Nintendo’s home market. The 64DD was intended for export too, but it got delayed into oblivion until by the time it launched in Japan, the Dreamcast had already been on the market for more than a year, and the PlayStation 2 was only a few months out. It was a little too little too late for there to be much developer interest, and it’s not like the Nintendo 64 had received a stellar amount of developer support or sold particularly well to begin with.