I will say one nice thing about the story: it's cool that they didn't pull the punch of BT being permanently gone. I think it has more emotional oomph in light of the game introducing you to the possibility of removing a Titan's data core and installing it in another chassis. Obvious set-up for "okay but he actually survived" and NOPE, expectation subverted!
I also liked Cooper's last dialogue about his ambivalence about being assigned to a new Titan. It's good un-resolution