I used to love fountain pens, they feel amazing to write with, and the variable line thickness makes everything look awesome.
They are also a massive pain, the higher end ones use gold alloys for the nib, making it delicate, if they aren't used enough the ink dries in the nib, they tend to get ink everywhere, and they can be really inconsistent.
Those sound more like dip pens with some old iron gall inks.
Modern nibs are able to be used in pretty much any orientation, and they use modern inks which don't dry out, if you keep a cap on them. I have several pens with caps that sit for years and don't dry out, nor do they require any different writing methodology.
They are also a massive pain, the higher end ones use gold alloys for the nib, making it delicate, if they aren't used enough the ink dries in the nib, they tend to get ink everywhere, and they can be really inconsistent.