The US government is generally hyper-conservative in the financial space of what the Fed directly controls for myriad reasons. The bank of computers that reconcile transactions between banks still shuts down on the weekends because the law around its operation is based on the old law where human clerks were doing the reconciliation.

The cost if it doesn't work out is damage to the trust in the system and the stability of the dollar in general, which is the thing the Fed pathologically seeks to avoid.

And as the country that can mint the currency the IMF designates other countries' international debts in, the US doesn't generally see itself in need of further strengthening the USD's position in the world.

(Interestingly, when I lay it all out like that and add it up, the US monetary policy looks like a big business's bureaucratic system, the kind that'd be ripe for disruption by a startup. Of course, it's not quite so simple when we're talking nation-states and not Silicon Valley ventures).