One in every city is too much, plus we only have artwork for the three existing resources at present. I've considered bumping it to 2 in first three cities, and 3 in cities on different landmasses or in capital. That'll give you two resources to trade from your capital, and potentially four more to trade. Combining that with their higher gold yields, their bonuses from the Candi, and the potential for the Oral Tradition Pantheon makes them quite potent.
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Wow man, I did not mean one unique luxury for every city. I meant one random of the existing 3, even cutting that number down to two or one would be fair. And if that is still unreasonable then as suggested a hardcap at the number of civs on the map would be fine. (2 cities on duel, 4 on tiny, 6 on small, 8 on standard, 10 on large, 12 on huge).
Since I can't really explain my feelings I'll try once again, the UA feels really boring once you've settled your first 3 cities. Settling 3 cities on a map larger than duel isn't really an accomplishment, you can pretty much expand away from all other AI and still settle 3 cities. My vision for Indonesia is that they take the risk to keep expanding to either worse/remote locations or into the AI because they know that their expansions are worth more than other peoples expansions (because of spices). This creates a more fun playstyle for the player, trying to get away with as much expansion as possible while being ready to defend your borders (whereever they may be). You also need to keep in mind that if your expanding pisses people off you have no tradepartners for your spice anyways, leaving you with no real win anyways.
It also creates a more interesting playstyle while you're playing against Indonesia. You can either play friendly with them and try to get them to trade their spice with you, or you can prey on their weak expansions and take their spices for your own.
My other point is that without your spices your UB is pretty damn situational and boring, I mean I still haven't haven't built it in half my cities in my current game and I'm in modern era now.
Also I'm well aware that this is not the place to discuss this and that I should have taken this in a leader discussion thread, but I just didn't expect it to turn into an argument. In fact I'll just doublepost this in the leader discussion thread if you feel like responding to it.