You probably are not the target audience. As a graphics engineer, the more compelling use cases of ray tracing are things like visibility tests, which can be t

You probably are not the target audience. As a graphics engineer, the more compelling use cases of ray tracing are things like visibility tests, which can be temporally stabilized by adding a low-discrepancy noise to each sample and used to perform leak-free global illumination. Samples can be used to feed other aspects of the pipeline like generating soft shadows, or atmospheric effects, etc. It's an API tutorial, for professionals in the field. Ray tracing is just one tool in the toolbox, not the alpha and omega of how the frame gets composed.