This definitely varies by country. In the US, fountain pen use is common among people who have a particular interest in pens (e.g. collecting them), and almost

This definitely varies by country. In the US, fountain pen use is common among people who have a particular interest in pens (e.g. collecting them), and almost zero among everyone else. I’d say they’re roughly comparable to mechanical keyboards in this respect. No one at any level of school is required to use fountain pens; typically, students use a mix of graphite pencils, ballpoint pens, and rollerballs. I would expect a large fraction of Americans, maybe even the majority, to be surprised to learn that fountain pens are still in common use anywhere in the world.