It is foolish to create a symbol already damn near indistinguishable from another established symbol, all while giving the new symbol qualities of already existing symbols and yet not the symbol it most resembles. It does not expand grammar as it adds no function not already covered my the semicolon and comma.

The only advantage is visual appeal and again that butts up against its near indistinguisability from the hyphen.

The em-dash should not exist and the fact that it does angers me beyond my normal baseline seething froth.