Nonsense. No one argues that the shape of clouds is intelligently designed. No one argues that simple things could not have arisen by chance. The argument of intelligent design is that some things are too complex to have arisen by chance. In fact it rests on Darwin himself:
"If it could be demonstrated that any complex organ existed, which could not possibly have been formed by numerous, successive, slight modifications, my theory would absolutely break down. "
This is one of the few statements he made proposing how evolution could be falsifiable. Therefore it is perfectly legitimate to take him and his theory up on it.
Creationists are all over the map on when God stops manipulating and just sits back and lets things happen. It was once thought that angels pushed the planets around. Some people are still in about the same place.
No one argues that simple things could not have arisen by chance.
I don't personally equate chemistry with "chance." There's nothing magic about complexity, either. At any rate, no sub-optimal "design," however clunky, disproves ID. Not the human back, or the many diseases of man and animal, not the patterns of extinction in the fossil and historical records, nothing. "God has his purposes and could have left it that way."