Why isn’t there a universal sign language? One that everyone around the world could learn so that they would be understood no matter where they lived, or travelled to? Who decided it was a better idea to have more than one?
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Certain cultures use different facial expressions and gestures. Those gestures may be similar to or exactly like a common sign in different sign languages. Picture a common gesture for why in a language being giving someone the middle finger. It’s not the case in reality but it illustrates the idea that innocuous gestures in one culture mean something entirely different in other cultures.
Also, different languages have different rhythms to them. So flowing from one sign to another in one language isn’t as smooth as something more purpose built.
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