[Centigonal]

I can't disagree with your lived experience, but I have to say that mine has been different. I've never taken a penmanship class, but I did write almost exclusively with fountain pens for about four years at the end of high school and the start of my undergrad.

For me, writing with ballpoints required more pressure and a more upright grip, while fountain pens love to write in one flowing line at an angle to the page. When writing with a fountain pen, I will tend very naturally to cursive. With a ballpoint, cursive is a real chore.

I do agree with your last point, though: OneNote has replaced my fountain pens and ballpoints nearly completely at this point.