If I recall correctly Fallout 4 still didn't even fully achieve that. I think you could kill a few faction members every now and again and, so long as you waited and they weren't named or important, it'd let you slide. What's horrible though is I don't know if the times that was a bug or not, but you'd think they'd get madder at my heavy weapons character when they blew the hell out of the kid I was babysitting. The only thing that makes me think it might not be is because Diamond city works the same way. You can gun down half the town and leave for a couple months and, on return, nobody's hostile.