I'll echo everyone else in that you don't need them but also go further and say don't get any of them to start. The learning curve is a little steep and a vanilla play to start is a good idea. Then you can pick up some quality of life mods and whatever else floats your boat. The game is disgustingly customizable. You can get nuclear power and missiles, dropships, robots, custom furniture armor and weaponry, genetically engineered catgirls, literally anything. It's infinitely replayable with mods alone.