It's not. But keeping coins moving is. Any waste of resources in this instance is negligible. But I am more likely to spend coins if I am consciously aware of them as a resource, as would be required in order to move them.
+1
The good for the economy part is emission which compensates for lost coins. They will have higher velocity than average.
-1
I don't see any need to re-issue lost coins, rather just allow a deflation in the money supply. Economists hate deflation, but investors love it.
One unintended consequence might be that investors are more likely to delegate their holding to a third-party (e.g. a bank) to ensure the coins are moved in a timely fashion.