Comment by JohnFen

True, and the new design is better than the old because of it. But it hasn't resolved the issue enough to really matter. Some less subtle physical difference is required -- put a hole in it, make it an obviously unique size, whatever.

At least that's how it seems to me. It's an interesting design issue. I don't personally care too much -- I'm fine with the paper bill -- but I do have curiosity about why the coin designers have made the decisions they did about the $1 coin.