You don't have to, but they will just take up hard drive space. Look through the list of whats in the packs and if its in the pack no reason to have it twice.
Another option guys can do is say screw the packs and just download all the mods individually. It just requires having 30+ mods checked when launching the game. Its not impossible just makes it little harder to keep everything organized of what you need.
Now ARMA3Synch utility has a solution for that if any one wants to go that route.

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