Paul, all you have to tell people who are yelling that Arc doesn't have X: "Yes, you're right, it doesn't have that. Arc's at an early stage, just a preview of the main idea behind the language. Some of these problems, yes, they haven't been solved yet. Besides, I could have just decided not to release it." One can't argue with that, unless one's a jackass.
Instead, you aren't saying much besides "I'm right, you're wrong." Which is an arguable premise.
