I recently started learning ASL, the first thing the book goes over is history of sign language. It made me consider this same question you posed, but brought up a good point of “theres more than one verbal language right? Why would there only be one sign language”
Also sign language isnt just “<spoken language> with hands”, its a whole unique thing with its own grammar and what not.
And the various sign languages all have unique things related to the cultures that made them, its not like people are willing to stop all other verbal langages because english should replace everything.
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