We had to use an ink pen, but could choose whether to use one with insertable cartridges or a fill-from-a-bottle one. As for why, well - they are a lot smarter than a Biro.
I used ink cartridges initially, blue or black, then someone gave me a bottle of orange ink and a proper re-fillable fountain pen, so I used that for a while. After I used up the orange ink I found that you could buy coloured cartridges, so I bought green, turquoise, and purple and used those (I had three different pens, otherwise the ink from the previous cartridge tinted the current cartridge).
If I want to write something nicely (like a wedding card or something) I still use a cartridge pen these days, with black ink. I like one with a nice wide soft nib; I have won several with gold nibs which are excellent.
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I used ink cartridges initially, blue or black, then someone gave me a bottle of orange ink and a proper re-fillable fountain pen, so I used that for a while. After I used up the orange ink I found that you could buy coloured cartridges, so I bought green, turquoise, and purple and used those (I had three different pens, otherwise the ink from the previous cartridge tinted the current cartridge).
If I want to write something nicely (like a wedding card or something) I still use a cartridge pen these days, with black ink. I like one with a nice wide soft nib; I have won several with gold nibs which are excellent.