Leigh Reyes, whom I encountered online through fountain pen circles, made a video demonstrating the differences between ballpoint-writing and fountain-pen writing.
And much as I cherish the capacities of the computers on which I rely, the same point — “with fountain pens, it’s very different” — applies as well. The muscles you use, and how you use them; the practical aesthetics of writing; the sense of engagement with the writing that results; all of these matter differently when you’re writing with a fountain pen.
Ballpoints may be better for some (it’s hard for me to imagine, but I concede the point right away because I don’t care to argue about it), but a number of us think that the bother of dealing with fountain pens rewards us amply. Think of it as “heirloom writing,” compabrable to heirloom gardening; or as scribecraft, as woodworking or metallurgy. It is wrighting, and we find that fountain pens are the tool for this job.