These are 'supportive' cards. I personally don't think that we need more connection cards.
I do wonder what happened to Scavengers (remastered Ruins) expansion though. 51st State Master Set has been surprisingly lacking in expansion front so far compared to support Imperial Settlers got by the same time after release :/
I'm not sure how quickly they would expand the Master Set given that it encompasses years, and several versions, of the game.
I would guess we see a GenCon release for Scavengers.