Even when using Unity and Unreal the ramp up time is still significant since we all use different source control, bug tracking and project management software.

Even when using Unity and Unreal the ramp up time is still significant since we all use different source control, bug tracking and project management software. We also build large complicated systems on top of the game engine which come with their own terminology and best practises. Then there's the different back end and external APIs and libraries. I agree the situation is better now and getting better.