[mkl]

Looks like you have a few misconceptions there. There are many different sign languages, just like there are many different spoken languages, and they developed in much the same way. Sign languages definitely have accents and dialects, and are not inherently easier (they're full complex languages with all kinds of nuances). This tool doesn't translate sign language signs, or even detect them. Your argument basically amounts to "everyone should speak Esperanto" or similar.