This would be a lot easier to sort out if the hybrids had their own victories.
But the devs said that would confuse players.
"Too many choices."
Yeah, I'm not sure how that would create too many choices since the other pure/hybrid affinity victories could be designed so that they're not available under your current one. *shrug* Plus, it would help to diversify endgames between each different game you create and play through, since you're probably not going to be the same affinity or hybrid each time -- unless you purposefully pursue them because they're your thing. Also, it makes stopping your opponents from winning more interesting instead of only the three different affinity victories plus Domination and Contact.
And "too many choices"? It's a 4X game, haha. I'm sure a lot of fat can be trimmed in many existing areas of the game.
Also, Firaxis went the route of creating hybrids which are pretty different from their pure affinities, and even look very different, instead of trying somehow to combine them half and half (a wise choice!). They definitely need their own victory types. Perhaps the second expansion can flesh-out hybrids a bit more -- maybe even give them their own symbol and name (my hidden agenda with this thread, haha).
For example, does H/S really want to become one with the planet? I think they would be the most likely to simply exploit it (again), like on Earth, and then move on to the next planet to consume and grow more powerful from.
Or P/H, do they really want fresh Earthlings coming into their world and contaminating the gene pool of their population?
Surely S/P doesn't want to emancipate Earthlings from their biological bodies. I guess this one isn't as awkward, they're saving the Earthlings from the hardships of that planet so that they can come to the luxurious new one and be served by the machines.
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EDIT: Oooh... Actually, maybe they tweaked each victory so that the hybrids pursue these victories:
Promised Land: Purity or Supremacy/Purity
Transcendence: Harmony or Purity/Harmony
Emancipation: Supremacy or Harmony/Supremacy
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We have yet to see anything about the revised victories in Rising Tide. Hopefully,
1. They're more flexible to each affinity combination and make sense. The story and descriptions of each one are fantastic, I hope they remain so after being changed.
2. More enjoyable to actually pursue (and inhibit!). As said above, the flavor is great, it's just that they're boring to work towards during actual gameplay.