Users of ArcGIS 10.2 will recall a frustrating issue regarding file geodatabases. Geodatabases created in 10.2 were often unreadable by users still on 10.0 or 10.1. In an industry built on data sharing, this forced many organizations to upgrade prematurely or stick to the older version to maintain compatibility.
For data managers, 10.2 introduced the ability to move Enterprise Geodatabases between DBMS platforms (e.g., from SQL Server to Oracle) more easily. Additionally, raster handling saw a massive upgrade with improved mosaic datasets and new raster functions, making image management significantly faster and more dynamic. arcgis10.2
The biggest downside of 10.2 today is simply its age. It is no longer supported by Esri. It does not support modern cloud infrastructure natively, and connecting it to modern services (like ArcGIS Online utility services) is increasingly difficult or impossible. Users of ArcGIS 10
Are you writing a of GIS software evolution? For data managers, 10