Mr. Zuckerman's opinions on the quality of license built vs original manufactured items is only his opinion. I have made a living helping license manufacturers get their quality up to factory standards. The idea that the original design and manufacturing team cannot meet the standards they themselves set is clearly incorrect.
Also, many helicopter manufacturers make many transmission parts for their transmissions, unlike Mr. Zuckerman's incorrect assertion. Most manufacturers do the final machining, assembly and testing. No manufacturer makes all the parts of their transmissions. All buy bearings, gearbox case castings and the large gear castings from other aerospace manufacturers. No helicopter manufacturer has the facilities, experience or volume to make gearbox castings, for example.