1) The best possible state for a currency is one of stability
2) Units of currency are lost or made inaccessible
Therefore;
Controlled and steady inflation is better than a static money supply.
1 is not a given. You can't possibly define "best", much less "stable". Hell, you probably can't even define currency, but that isn't important here.

At any rate, you certainly haven't tested various configurations to check their properties for bestness (whatever that is).
Also, it does not appear to me that your conclusion follows from your argument. You have a bait and switch thing going on.