Warning: this is spolier for anyone who haven't played fallout new Vegas, if you don't want to see it, I suggested you to play the games out there
Btw back to the discussion
So I wonder what happened to yes man after the events of new Vegas which you killed the barbie guy Ken knockoff named Benny (ignored that, because I'm just sarcastic), now I wonder where he is during the event of fallout 4??, since there is no mention of yes man somewhere,
I think yes man could be destroyed and then scrapped on the junkyard after you killed Benny or probably Benny smashed him to the floor and smackdown, because he disobeyed his orders, but that's just speculation, because the game doesn't show Yes Man Being destroyed, which means that he was either still alive or not