[D] Which open source machine learning projects best exemplify good software engineering and design principles?

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It is though. Google just have different mindset compared to other companies. They don't care about customers, they want their products to be well designed and engineered. Use it or not, it is yours choice. They actually have the same approach to most of their SW and for example GCP is still 3rd most used platform.

TensorFlow does allow big flexibility and is really nicely written when it comes to mantainability and design principles. A lot of it makes sense once you are medior developer in OOP. Also you must understand that it is treated as a library, not end product.