because we have to fill or change cartridges, buy or make ink, clean the nibs, carry our pens carefully… too much effort just to write
ballpoints are efficient, sturdy and effortless. There are situations when we have to write/mark quickly while standing or outside under the weather
it’s not a question of “superiority” but practicality. when i’m writing or drawing on my desk i use a fountain pen. outside i carry a small zebra ballpoint