I thought the actual ending for the murders was expected and the only way it could have ended.
But the personal ending for Rust was amazing and beautiful. I really identified with Rusts thoughts and beliefs throughout the show and his quest for Philosophical realism is really in line with my understanding of the world. I also think that a big part of the youth of Western society (that likes to philosophize) has these views and finds their beliefs in science or realism.
Rust "letting go" this episode was not about him dropping into his death or walking towards "the white light", I think it was about stopping his quest for realisme and embrassing him being human and having human thoughts. It reminded me of him saying "Self-conscious is the worst thing to happen to humanity, in its evolution" and it looked like he was talking about religion then, but know it seems like he was talking about himself. That a quest for realism and a truth might only lead to darkness and that "letting go" is more beautiful and leads to light.
Basically to sum up, if you always look at the ENTIRE world and try to understand it, the conclusion is ..... it sucks. This is where I often find myself when overthinking everything and although I find it fun it doesnt lead to much "light".