Since it's always lightside vs darkside, there's no real need for more than 1 full playset unless you're doing 2v2.
Even in 2v2, 1 playset is enough as you can't use more than that anyway:
Balance of the Force rulebook wrote:
Objective set limits that would apply to a single player in 1v1 play are applied to the entire team. For instance, a
team may not have more than two copies of any standard objective set, by title, in their decks. If an objective set has the text “Limit 1 per objective deck,” only one player on the team may use a copy of that objective set in his deck.