What if economic problems are structural, not monetary?

The job openings for February is out. There are 5,133,000 open jobs in US. This is the highest in 14 years:

There is no argument about underemployment. Many part timers would like to have a full time job. At the same time, job openings go unfilled. This is a structural problem. Peoples skills do not match the available jobs or they are not willing to relocate for a job.

Given the structural issues, perhaps there is not as much slack in the economy as FED thinks. Perhaps US economy is a +2% growth donkey and not +4% race horse. This may be as good as the economy can possibly get and no amount of whipping with 0% interest can make the donkey go faster.