AppScan is able to collect and to analyze a lot of data points for you. For example, the third party libraries take ones minutes to analyze on AppScan and hours to do manually.
A new dev is joining the team... AppScan reports allow you to structure a lot of information and simplify the process of bringing someone on board for a project
It's possible to check everything. AppScan is checking the App structure and give your recommandations and list of improvments.