Because it parses, visually, EXTREMELY similarly to `{` in a place where almost everybody who programs in a brace-y language will expect a brace. Thus most peo

Because it parses, visually, EXTREMELY similarly to `{` in a place where almost everybody who programs in a brace-y language will expect a brace. Thus most people will not notice it unless you point it out very explicitly, and it has the potential to cause great confusion.