Or consider key programming. A used car lot brings you a 2017 Kia Optima with a lost key. A locksmith wants $400. With your offline GDS 2019 and a $20 blank key, you program the immobilizer yourself.
Deep-dive diagnostic trouble code reading with guided repair procedures.
Offline software doesn't crash because the internet drops. It doesn't have laggy cloud servers. When a customer is waiting for a steering angle calibration, the 2019 offline tool is instantaneous.