Grammar teachers have pounded it into the minds of multiple generations of students that ending sentences with a preposition is a sign of poor writing. However, it is now an accepted conversational and written convention because ending a sentence with a prepositional phrase allows for informality.
CORRECT: Books, magazines, and newspapers are for what writers live.
ACCEPTED: Books, magazines, and newspapers are what writers live for.
The second example is much less formal and easier to read because it is how most people are familiar with speaking. Uncapped has important information that we want to convey to the most amount of people. Too high a level of diction may put some readers off.