Item: Ease up on singular they. It has been around since Chaucer was in grammar school, and it's not going away. We need an epicene third-person, singular pronoun, and they is it, by historical precedent, by example from reputable writers, by evidence from current published usage. Accept no substitutes; scores have been invented, and not one has ever taken. Hold the line in the most formal writing if you must, but it's time to face reality.