Fourth try! (Fifth, if you count the failed attempt playing Sweden.)
Trying with Seondeok of Korea. Dunno why I didn’t try this one earlier, as it seems most optimized for science of all
Korea run is going well. But I’ve also been thinking about why the diplo victory seems to be so OP (as the kids say)
It was added in an expansion pack and is exactly the kind of game balance-ruining stuff that comes along in expansion pack features
You win a diplo victory by accumulating diplomatic victory points. You mostly get these by successfully passing resolutions at the World Congress (which is like the Apostolic Palace and UN from Civ IV but less useless)
The World Congress, though, proposes rule changes that can advantage or disadvantage you according to which way the vote goes. So it’s natural to want to invest a lot into getting resolutions passed, even if you’re not explicitly aiming for a diplo victory
Votes at the World Congress are weighted by how much diplomatic influence you spend on them, a currency which is gained by playing well with city states
But it’s also natural to want to play the city state game, because city states – of any kind – also bring other advantages that can help with some other victory or (more crucially) help to fend off the possibility of some other civ winning another victory while you’re still aiming for a specific win condition