Fountain pens are like mechanical keyboards. People use them because they make the act of writing _feel_ good. It's not about the tech, but rather about the pleasure of using the instrument. How smooth do you want the nib to be? How much feedback? How bouncy/flexible? How much line variation? Discovering (or modding) your preferred nib is a bit like discovering the one switch that suits you really. A bit of a rabbit hole... And then of course you get into inks.