Same reason there’s no universal language in general. People all around the world came up with ways to communicate independently of each other, there was no big meeting where they decided how to do it, and every time someone tries to force that to happen it doesn’t work because making everyone do things your way is a pipe dream at best and tyranny at worst. The development of sign language was *more* recent and *more* intentionally constructed than most spoken languages, but that effect is pretty hard to avoid anyway.
Latest Answers