What are the benefits that Apple would get if they would start to make their own iPhone parts?

What are the benefits that Apple would get if they would start to make their own iPhone parts?

Potentially slightly higher profits, as well as better sourcing guarantees. These are really complicated devices requiring a lot of different engineering and manufacturing expertise, they would use multiple sources when possible to better protect themselves from any disaster at a single manufacturing facility. Apple certainly just buy out supplier companies if it made economic sense.

There may not be any benefit, depending on their expertise at manufacturing since they really don't manufacture much. They would have better control of potential "leaks" on new designs, but likely will have higher costs.