Also, why do publishers make you download the entire game even if you have the physical disc because they have patches. Does that mean the physical disc is so flawed that it is completely unplayable upon release? Have they ever heard of Quality Control?
The Xbox One doesn't play Xbox 360 discs directly. It's all done through software emulation. The physical 360 disc only serves as a validation tool - that the disc is in the machine. It doesn't do anything beyond that. It's similar to how game installs worked on the 360.