In order to be agile, to inspect and adapt and to learn fast you need to get feedback, so a strong and quick feedback loop is essential for success with Agile. Credit for image on slide 8 goes to https://www.flavioderoni.ch/. You can find original at https://www.flavioderoni.ch/2017/01/when-they-ask-you-what-you-do-for-a-living/