Ultimately there is no good outcome for anyone. V can save their life, but at the cost of becoming a nobody, killing Johnny and at best maybe be another suit behind a desk at Langley. You will never have meaningful chrome again and all your friends have moved on. Reed becomes even more disillusioned and, as Johnny says, he might hang himself. Not that Reed was a good person, he betrayed Songbird, by allowing the NUSA to turn her into their Blackwall tool, where the AIs took a part of her personality every time she connected. Reed still buys into the patriotic ideal of country, duty and honor and he desperately grasps at these ideals, cause he can't bring himself to face the hard truth, namely that all of this is bullshit and exploited by politicians like the president to get good little patriots like Reed to play along. If you kill Reed V can drop some hard truth bombs on him, if you use all the dialogue options. Which are some of the best lines V has in the game. In the other endings you can also talk shit to the president and tell her how awful she is and that you want nothing from the NUSA. The relation between NC and the NUSA should be close to a war, after they attacked NC's space port.
Songbird will either die, or (if you pick that outcome) will be returned to the NUSA, who will use her until nothing is left. Sending her to the moon is probably the best outcome, but we don't know if she survives the trip, even when attached to the rocket's life support system. And we also don't know what Mr. Blue Eyes' intentions for her are. Still, seeing her launch into space where the NUSA can no longer get her, is a good thing, cause in the end she is free, even if it's just for her last moments. Even Johnny likes that outcome and seems to learn something from it. Yes, she betrayed us in the beginning and only came clean when she was close to death, but I play Phantom Liberty as if V is Roy Batty from Bladerunner. Another character who was grasping at straws and left a trail of bloodshed behind him in futile attempts to cheat death. But when he realized there was no escape, he did a final act of compassion by saving Deckard, even though Deckard was his enemy. In that context Songbird is my Deckard and once you played through the ending with the Militech bunker, you start to understand her character a lot better and you experience why she would rather die than ever return to the NUSA. Compared to Songbird's tragic story V's life is a comedy.
I like the expansion, cause the new ending brings us full circle to Dex's prologue question "A long life as nobody or go out in a blaze of glory". Now that the "long life" option is available, you can make a meaningful choice and are no longer forced into the "Death in 6 months" endings. And suddenly you realize that survival at any cost might just not be worth it. The new ending also adds a slightly more hopeful touch to the other endings - cause it shows that Mr Blue Eyes really has access to black clinics on the moon and it also shows that there might still be hope in the Nomad ending. Even if it requires a captured AI and cutting edge tech....
I also have a suspicion that the FIA screwed up V's surgery on purpose. Cause at the end of the game a fully cybered V might be too dangerous and too much of a wild card to let roam free.
There are also some missed opportunities. Sending Songbird to the moon should either have tied into the Arasaka ending or the Crystal Palace ending, where V also goes into space. Would it have been so hard to have a fixed Songbird come back and help you in these endings, by slowing V's cancer, so that we maybe get 10 years instead of 6 months? Or have her return during the Mikoshi scene, after she got better on the moon, and have her help Alt in curing us? Or suddenly have her voice on comms when you are approaching Crystal Palace:"V, it's Songbird. Thank you for everything, now it's my turn to help you. We will do this together".
Is it really too much to ask for one happy ending, in a game that has so many downers?