The Panel Container component is useful if a designer thinks that a set of item(s) is too large for the canvas and wants to be able to scroll the inside of the canvas. A good example would be a scrolling set of charts. Let's say real estate on the dashboard is an issue and we have many charts that need to be shown, but it is not mandatory to show all charts in one view. If we put them in a Panel Container, we can scroll through each chart, similar to a slideshow.
In our example, we were able to emulate a slideshow of charts. This is useful if all the charts do not need to be visible in one screen, and will allow designers to save on real estate.
If you are inserting multiple objects in a Panel Container you must make sure that the business is okay with the scrolling. In the majority of cases, it is a best practice to show everything on the same screen without having to scroll. In some cases, such large tables with many columns of information, we may have to resort to using the Panel Container in order to facilitate the best use of the real estate.