The opposite of Open of course is Closed.
Once something is closed, you've locked yourself off from a lot of routes, unless you start contradicting "canon" an cause few lore-wars.
Best simply not to go there, except in game.
Even with open you still get lore wars. IMO there really stupid lore wars. Each side fighting over nothing because they have nothing.
Closed is better because you have lore, history, canon! Sometimes things do have to come to and end and that upsets some people. Still its better to have things make sence/logical, continuing the saga, then it is to have no history, anything goes, Michael Bay explosions replacing writers. Nothing making sense, having the same factions in every game playing the same role over and over again.