I know this may be to late but first i love the game so fun but feels empty even with the robots and few NPC in the bunker but after doing some quests about the resistance and some of there people and things they are doing. But you never see any only what there doing or where there going or where they have been from letters or marks.
And bodies now and again my thought is to give them some extra things to do like now and again like a random event or quest you fined but not all the time. You can come across a few of the resistance fighting the machines either loosing or winning and you can help them. Your reward is you can just loot the robots and maybe get something from the npc or not.
Then they either just run off back to there hideout or stand there checking there stuff until your gone then they just disappeared they do this in other games you come across a warrior or something fighting something els you can help or not. This is to make it less dead looking and that the resistance is there and doing something.