Full file system extractions are the next best acquisition when compared to physical acquisition. However, this extraction method may be the best way to obtain the most information from FBE (File Based Encryption) Android devices. When you get Full file system access, you should expect to pull application and data files from the device. Nothing is guaranteed, unfortunately. This is where it depends on the application developer and whether or not they elect to have their data pulled via an adb backup or that level of extraction. If you are not able to see application data here, you may have to resort to chat capture or obtaining cloud data. Bottom line, you never know what you are going to get! Get as many acquisitions as you can to ensure you get data to examine.