The other denominations used to be older than the $1, and were all updated to add some security measures, and they updated the designs while they were at it. The $1, as it is, already has some security features, which the mint seems to be good enough considering how little it’s worth. If it doesn’t need to be changed, they aren’t going to change the design just for aesthetic reasons.
The $1 also isn’t really worth updating anymore because of inflation, so someday they are just going to stop printing them and switch to dollar coins, although there is a lack of political will to do that.
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