Coincidentally, I'm playing a peacenik game lately: Sparta, Emperor, Epic, Huge Continents & Islands. I wasn't intending to play that way, it just happened that I had a large area all to myself, and I was able to found 16 cities without fighting any wars. In the Medieval Era, Russia declared a surprise war because I hadn't upgraded my Classical-Era army and the AI's calculation doesn't take into account the fact that it sucks. So I spanked Russia and took 3 of their cities. Two of the three cities were former City-States, and in retrospect I regret not liberating them. I also recently colonized a large island, so I have 20 cities even if I don't conquer Russia, which is more than enough. I might reload a pre-war save just so I can liberate those 2 CS's and get those bonuses (I don't think liberating a CS automatically makes you their Suzerain, but iirc you get something like 100 Diplomacy Points). It looks like I could coast through this game without ever declaring war on anybody or ever capturing any cities.
How changed the peaceful style after the last updates? Do you recognize some changes? Do you have some new tricks to avoid early wars?
No, it doesn't seem like anything has fundamentally changed in the couple of years since I started this thread. The recent changes to coastal cities make a pacifist strategy more effective, inasmuch as they make an
isolationist strategy more effective. Coastal cities ought to improve international trade, which would in turn promote the growth of navies and the "international entanglements" that would draw you into foreign wars. But they don't. Oh, well.
The challenge to a pacifist game remains (a) founding a lot of cities early, when simply taking them isn't allowed and (b) what to do about a 'runaway' AI civ, when declaring war on them isn't allowed.
One thing I didn't address in my first post was Emergencies. I guess the question of whether to allow yourself to join an Emergency that requires declaring war depends on whether you think liberating a City-State from the clutches of a warlike civ counts as "maintaining the peace" or not.