This is, in some way, a skeleton of a list.
Others agree, which is why there are 89,000 mods on the Arma 3 Steam Workshop. Even with all the DLC, it’s still more of a sandbox for you to fill and play, but that’s what it was built to do.
As an on-off Arma 3 fan (250 hours seems like nothing in the Arma scheme of things), I generally find the base game not much of a game.
