I do a lot of long-form writing. I switched from typing first drafts to writing them and saw improvements in my creativity, organization, and general quality of writing, and also found that I finished my work faster. Then I switched from ballpoints to a fountain pen and saw what all the fuss was about. People who write a lot appreciate how smooth fountain pens are, how the well-designed fountain pens have great ergonomics that reduces hand fatigue, and how the ability to pick your ink can let you fine-tune your writing experience even more. Yes, they can be impractical, and I can absolutely see how disposable ballpoints and rollerballs eventually won the market competition (in the US at least) but modern fountain pens, for some use cases, deserve a try.