Challenges in Tabletop exercises?

EDIT:
After reading some answers, I realized that I missed the core question. So the question is more like:

Is a Tabletop Exercise the right tool to raise senior management awareness for cyber security problems in the org or a timewaste in regard to that objective?

ORIGINAL:

We run regular tabletop exercises in our company, my main objective is to raise top management awareness for strategic challenges in information security.
Yet, I find them sometimes very time consuming …

awareness challenges cyber cyber security cybersecurity edit exercise exercises management org problems question raise regular run security tabletop tabletop exercise tabletop exercises tool