I agree with you and BUT please read all this my description
To be honest, a lot of video tutorials have been released for Unity, but due to the change in APIs, it is not possible to use videos tutorials for different versions.
These problems that exist in API Unity do not exist in API Unreal 4, but Unreal 4 is not a naturalistic engine based on natural systems, and you have to build everything from zero.
It’s really scary to build everything from zero like 3D water, water ripple effect ,time of day system, weather system and so on.
I have a lot of experience with game engines and I’m sure Amazon have great roadmap for video tutorials and tutorial documents for Lumberyard.
Amazon is looking to change the DNA of making games in a new way and the best listener on this planet.