Came across this article. What are your thoughts as to his reasoning as to why PC calc may have been banned?
“Learnings from building a Today View Extension in iOS 8” by Christopher Truman
https://medium.com/p/710d5f481594
"PCalc provides a full calculator in the Today view. It breaks guidelines all over the place! It is too tall, too many buttons/taps, and doesn’t provide quick glanceable information. It has a nice use of the vibrancy effect, while making the button text a solid white color. It is definitely a tool meant for power users. Yet Apple has approved it and even featured it in the “Extend Your Apps” section. PCalc got lucky. Some apps with advanced features were not so lucky."