"Considering Sins is 'half' RTS, we dabbled with the idea of an RTS narrative to help carry the game's deep lore. The reason we turned down a campaign was simple: We had limited resources and were forced to decide between creating A: a title with strong gameplay, a solid engine, and great replay value, or B: a title with average gameplay, a rushed campaign and very little replay value. 'A' seemed the obvious choice to us at the time."

If you want to call this bragging about leaving parts out, be my guest.

That is a ridiculous argument to make.  Every game has features cut because of lack of time or budget, or simple design scope.  I think the only exception being Duke Nukem Forever, but if anyone really wants to make that argument, have fun waiting decades for your games.