If you believe it should be finite, you'd think you'd go for a non-fiat good - one that never had an arbitrary amount decreed into existence, and one that physically could not, ever.

How's that inflation avoidance doing anyway? You sure if my widgets are finite they cannot lose value? Last I checked (today) BTC inflated 45% more than USD did in the past year. Talking hypothetical is great and all, but no central planner has ever invented a good that doesnt lose value relative to other goods, and it doesnt start here.