Over the weekend I decided to just go over something that was burning at the back of my mind for quite a while and that was on creating 3D Airspaces to be viewed in Google Earth, not just extending it to the ground which is certainly doable but what happens when floor and ceiling are not to be touching the ground. The creation of these type of visualizations provides a clearer way to depict the complexities that are involved in these type conditions and also it provides a good way to discuss different things that can not be seen only on a 2D model.
Also pro tip, vertical exaggeration in Google Earth is only applied to terrain so if you have features you need to export those with the exaggeration already included. So basically use Vertical Exaggeration = 1.0 for everything to match
Most of the time we provide the 3D visualizations to be used for presentations for different stakeholders to be able to talk about new airspace design, the instrument flight procedure design revisions or even to review tracks of flights that occurred in the past and you want to explore through where they happened.
In short this is just one way to see things in 3D, there are other options that can be used but at the moment Google Earth is readily available for everyone to use and free.