What I see missing, that Xposed + App Ops gives me is the "Keep Awake"... having revoked this permission from almost all non-Google apps, my battery life is a full 50% longer than other people with my phone report.
Best i can tell, Doze is supposed to cover that automatically. But then Doze will wake the device up if a GCM priority notification comes down the wire. And i expect Facebook and the rest to start spamming those to make sure they get every nanosecond of your life to their servers.