Edit: I also see a problem with Open CGs that involve trading and Wars (Lugh, Banki, etc.) because of how the instancing works and how players choose sides. There seems to be a recurring theme of "Not enough to shoot" or "players joined this side and others were forced to switch sides".
Likewise for most trading ones it seems to be "Lots of pirates be a flying here" "Blockades" and the latter.
Its cool they can escape that entirely, but the ones putting up with it in Open could potentially corrode or desensitize playing in Open. Then you get players doing the exact same things with 100% of the same contributions, but without that extra risk. Adding incentive to taking those risks is what I view is the best solution to that.
Which for some, is the problem for some and for others, enhances the game for them. I don't think Exploration ones and the unique case of Operation: Dullahan ever really had this problem.
(Well Actually, Dullahan had no counter to it aside from either killing players or finishing the other Community goals faster, which was totally cool.)
Dont forget game advertized with that choices ..but i guess doesnt matter right?