I remember Photoshop during it’s infancy. One undo, no layers and memory issues. Well the memory issues are still there, but the rest of Photoshop has changed a lot.
There are a ton of books written about the program. Corresponding on one that deals with digital makeup, morphing and everything else that can be done to the human form was a fun experience. It’s no wonder so many people have self worth issues when high-tech airbrushing is out there.