The PT is about the Dark SIde gaining power and the downfall of the Jedi.
The OT is about the redemption of Light.
WTF is the ST about? The rebels really didn't win and this is where they REALLY win? The light is still better than the dark?
WTF is up with Snoke. I mean...WTF?
My take, FWIW.
PT= Hubris: The republic and jedi fell because they failed to see the evil in front of them all along. Anakin's hubris thinking he was all-powerful, lead to his downfall, and in the end becomes the very thing he wishes to stop.
OT=Redemption and vanquishing the villain: heroes journey where Luke, Leia, and Han seek to restore the republic. Luke seeks to redeem his father. The empire and emperor are destroyed.
ST= Iconoclasm: The previous generation (Luke, Leia, Han) are revered as legends but are actually flawed and imperfect (failing Kylo), the New republic fails to learn from history and allows the return of the First Order which defeats the New Republic, and it is up to the new generation (Rey, Poe, Finn) to realize the heroes they idolized are just people like them, and to correct the flaws/mistakes made by the "legends."