Good point. People sometimes use expressions with operators as arguments. My take now is that, because comments are required for cases such as the above, they

Good point. People sometimes use expressions with operators as arguments. My take now is that, because comments are required for cases such as the above, they require them everywhere. What should happen is that they be optional. Also, it just occurred to me that, while Lisp et al. don't use commas, they do use parentheses to bracket subexpressions, so they don't have a problem with the issue you just cited.