What up, Yousosmart.
I'm TreblMuffin, I'm the sound bro working with our cinematics teams.
I obviously wouldn't be able to speak to the overarching strategy of them, so the following is basically my take on the whole thing. You have to remember that cinematics are often only a piece of the story we tell when a champion is released, and that sometimes a piece is all we want you to have because that can actually show you who a champ is better. Follow me down this path...
So take a look at a champion like Jhin. He was really really hard to deal with. How do you show players how completely messed up that guy is? Well... that's the thing... to Jhin, the horrifying parts of life are beautiful. So we wanted to show that. We wanted to abstract death for players in the same way that he abstracts it for himself. We made something enigmatic, beautiful, but just a little bit eerie.
While A New Dawn is flipping awesome, I don't think it's tremendously compelling from a narrative point of view. It's just a really really cool fight.
Now personally, I would really like to see longer, more breathy narrative cinematics with all of that awesome depth of story and action I'm hungry for. Maybe someday, maybe not. But we're always going to work as hard as we can to make sure when something drops, it's a compelling piece of art. Let us know if we ever miss the mark for you, we're always hunting for these kinds of posts!