This style guide is depressing... The author's complete oversight of for-comprehensions, the convention of using apply, the insistence on using API-leaking side

This style guide is depressing... The author's complete oversight of for-comprehensions, the convention of using apply, the insistence on using API-leaking side effects for error handling (read: throwing exceptions), makes me weep. Spark is a Java project maintained by a company filled with Java engineers.