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The levers don't do exactly the same things; devaluing currency helps exports, for example.

There's also the political cost. I'm in favour of democracy in the ideal case, but obstructionism looks like a concern in some countries, people buy into lying spin and vote against their own interests, bills have their own cadence, and lawmakers are not always intellectual powerhouses. Case in point: the BoE reacted within hours to reduce the damage done by Liz Truss