It would seems very anti-theme if you could win a Spice victory when you only control say a third of Arrakis.
It is important that victory conditions be at least moderately feasible. The main point of a victory condition IMO is to have something that says "you win" that lets you avoid tedious late-game mopup.
In every game, there is a clear point where you have "won" in practice, where you are the most powerful player by far, and then often a long grind before you meet the actual victory conditions.
IMO the gameplay goal is to have the victory conditions be attainable not too long after you have become the de facto winner, and so to minimize the amount of grind.
Also, there is a distinction between controlling 1/3 of Arrakis, and controlling 1/3 of the land area. We have to remember that in any game, most spice tiles will still lie outside the "control" of any faction.
Absolutely.
I've not looked at victory conditions too much before, but presuming it is simple to remove them, I would favour dropping the Domination and Conquest victories and just having Holy War, Terraforming and a new Spice victory. The Spice victory might amount to pretty much the same thing as Domination anyway. It would add to the flavour at least.
This is what I meant in post #13.
Conquest needs to stay as a backup; at a minimum if you destroy every other faction you've won. But it should be unlikely to ever occur, because you can meet one of the other conditions before then.
I would be interested in making the CHOAM religion a bit more tied in with Spice production.
There is a pretty strong tie IMO already with the CHOAM shrine, which acts as an extra spice corp. I think the shrine is powerful enough as it is without needing to penalize other players.
One interesting thought I had was making the location of the CHOAM holy city/headquarters relocate based on who has the most spice harvesters,
I don't think this is fun. If you beeline to try to found CHOAM, you should retain that benefit rater than losing it because someone else went for economy/expansion already.
You still have the problem that if you control the spice, you effectively control CHOAM
I think this is an argument for not needing any explicit tie to CHOAM. If you control a big chunk of the spice production, then you have de facto power whether you control CHOAM or not.
The partial problem is that for gameplay reasons we have a disconnect; in the books, CHOAM owns all spice production, whereas in the game we have individual House spice corporations, that have no presence in the books.
So in game, by necessity we've made CHOAM more about trading other goods, rather than just spice.