Compared to fountain pens and ballpoints, "Sharpies" are actually the least sharp pen type.

Old guy here. Notice how highlighters dont have a pointed tip, but rather a slanted rectange. Black markers used to be like that. If you wanted a smaller line you had to angle it and use one of the corners.

Then sharpies came along with the pointed tip and everbody bought those instead. I cant remember seeing the old type any time recently, but I expect the crafts section would still have them.