I wish there were more scripted conversations between NPCs for you to overhear full stop. And yeah, some cross-party dialogue between companions would've been nice.
NPCs could use more to say
me: excuss me but can i get directions to freeside?
NCR guy: patroling the mojave makes you wish for a nuclear winter
me: ummm ok soo can get directions?
NCR guy: when i got this assignment i was hoping for more gambling
me: -_-
NCR guy: patroling the mojave makes you wish for a nuclear winter
me: forget this...HEY you over there can i get directions?