Now with BNW's new trade system (pure speculation btw), especially since they've taken out one of the big things on settling along rivers, you'd definitely have to give those sort of things a lot more thought. "Would it be more prudent to establish trade routes with Wu Zetian, or should I just steal her worker and mess up her early game just coz she built the Great Library". I suspect something similar with city-states since they could be the ones generating your early revenue if you start off sandwiched by those warmonger types, and DOWing them just for their worker... well, this bit we'll have to see how it goes, but I doubt you'd be generating much trade with those city-states when they are Angry.