Magic plans meet the reality called the Fed:
Trump World and the Fed, by Dean Baker: ...Suppose that Donald Trump's tax cut really is the magic elixir that would get the economy to 6.0 percent annual growth. But what if the people at the Fed's Open Market Committee (FOMC) don't recognize this fact? Suppose the FOMC thinks the economy is still bound by the pre-Trump tax cut rules and believes that inflation will start to accelerate out of control if the unemployment rate falls much below its current 5.1 percent level.
In this case, we would expect to see the Fed raise interest rates sharply as they saw the Trump tax cuts boosting growth. ... If the Fed raises interest rates high enough, it could fully offset the boost that Trump's tax cut is giving to the economy. In this case, even though the Trump tax cuts might have been the best thing for the economy since the Internet (okay, better than the Internet), we wouldn't see any dividend because the Fed would not allow it.
For this reason, the Fed's likely response to a tax cut is a fundamental question that reporters should be asking. If the Fed is likely to simply slam on the brakes to offset any possible stimulus, then a tax plan will have little prospect of providing a growth dividend.
Maybe they aren't asking because they know in their heart of hearts that the plan will be lucky to boost growth at all.