Conclusion
Kreia is the unreliable narrator of TSL. She introduces herself as Revan's last teacher, no longer Sith, and no longer Jedi. She wants you to believe she is morally neutral; this is even written on her character sheet. Like the ex-Jedi Vergere taught Jacen, the so-called Traitor: "Everything I tell you is a lie. Every question I ask you is a trick."
Kreia teaches us the lessons that war teaches. They are difficult lessons, and as always, they are the wrong ones. She teaches us what strength is: to lose our power, to lose everyone, and still survive. She teaches us what wounds are: the empty places that resonate with pain we have felt, and pain we have inflicted.
TSL asks, what happens to a Jedi after the war? Do they retreat from the world, like Atris? Do they turn against it, like Kreia? Do they sacrifice everything and everyone to save the world, like Revan did?
Kreia asks the Exile to go before the Jedi Council alone, unprepared. She knows the Council cannot be relied upon. When the Exile has Kreia alone, then she will prove that they cannot rely on anyone. She does this out of love, you see.
Related Works
My thanks to @ravenbrook for feedback and encouragement on this series. I am indebted to many KotOR fan communities for discussions over the years: the Tumblr folks, the AO3 folks, /r/kotor, kotorfanmedia, the Project Gizka folks, and y'all on Cohost.
I recommend Scorchy's screenshot Let's Play to first-time TSL players: https://lparchive.org/Knights-of-the-Old-Republic-II/
I recommend Onderduiker's walkthrough on StrategyWiki to repeat players, especially if you've thought about poking through the dialog.tlk text script: https://strategywiki.org/wiki/Star_Wars_Knights_of_the_Old_Republic_II:_The_Sith_Lords/Walkthrough