alright next on my 'this would have been a good quest' list is Vault Tec Rep and his (lack of) identity.
He is, after 210 years, still the Vault Tec Rep. He has no name, and still wears the same exact clothes. He mentions struggling to loose that identity despite holding a lot of (very valid) ahtred for Vault Tec.
I think there should have been a more in depth quest then that non-quest conversation you can have. Like you happen across him in the Rexford, then you can send him to Sanctuary, and then if you see him in Sanctuary again you can offer him a job and get the option to... send him to another settlement?
They could have had a quest where you bring him to some Vault Tec office, or you go by yourself, and have to find his desk. Maybe fighting some ferals and some emotional flavor text about knowing them but not being able to tell who they are or him saying he thinks he recognizes someone based on their clothes.
Find his desk with a spare ID card in it that has his name and face. Maybe an old photo of him with his spouse/kids/family/friends to jog his memory. Either he can take these or if he's not there you bring them back to him.
Only then can you send him back to Sanctuary (or maybe the Slog so he can learn to love himself as a ghoul). When you see him again he's changed his name and his clothes. He tells you about how he feels like a person again, and it's so good to hear the other settlers call him by his real name. Talk about how he has friends now and finds his job there fulfilling and rewarding, either farming to provide food or guarding to protect his new friends.
Or if you are the General of the Minutemen, and he really wants a job similar to his old one he could instead rep for the minutemen. Be a traveler with a little caravan like the provisioners and you can spot him in the environment. He will tell you small stories about the people he's run into or tell you he's sent [insert number] of settlers your way since he last saw you. (The number doesn't even have to be consistent with the actual settlers you've gotten cause they don't always make it to settlements.)
And if we wanted to get crazy he could have been a companion, and all of this could have been instead his affinity quest, where he slowly decides he wants to be more than just Vault Tec Rep. And it ends with him having learned to embrace his new life in the wasteland, more confident in fighting, traveling outside of 'safe' cities, and navigating the post war world as a whole thanks to the experience he gained traveling with you. This could not only be linked to your affinity to him but also the number of new locations you travel with him to add a little extra pizzazz.
Maybe even the quest to the Vault Tec building 'fails' and he has to pick a new name and form a whole new identity instead of going back to his prewar one.
It would be a great example of how change is scary and hard and take a long time and a lot of effort, but ultimately can be better for a person than staying the same, clinging to who you used to be.