I don't see how that's different than sign language... or any language at all. It's always just a whole bunch of symbols together or not, be it written, spoken, or by gesture. Learning what the letters "Hello" together mean, or what that specific hand gesture means, is about the same.
Also, some 'exotic' languages (like Chinese/Japanese Kanji) are very hard to learn and basically a whole bunch of lines and shapes in all directions, and yet billions of people still know those languages perfectly well.
Since all books are written, as well as the internet, and a lot of medias, you may as well learn to write/read even if you don't know the actual pronunciation.
I don't see how that's different than sign language... or any language at all. It's always just a whole bunch of symbols together or not, be it written, spoken, or by gesture. Learning what the letters "Hello" together mean, or what that specific hand gesture means, is about the same.
Also, some 'exotic' languages (like Chinese/Japanese Kanji) are very hard to learn and basically a whole bunch of lines and shapes in all directions, and yet billions of people still know those languages perfectly well.
Since all books are written, as well as the internet, and a lot of medias, you may as well learn to write/read even if you don't know the actual pronunciation.