Friday Night Lights is good — no, excellent — at a number of things. Among them: lens flares, honest emotional development, and reducing us to quivering, sobbing puddles on the couch. So it feels churlish to point out any flaws in this final season, no matter how slight — especially when the flaws themselves are often in service to the show’s strengths. Our potentially vexing question for the faithful: Might it be possible that Coach and Mrs. Coach are too good at their jobs? And is their inherent goodness, delightful wisdom, and incipient sainthood robbing season five of, well, drama?