It increases number of HP your dwellers get from each level up. From all SPECIAL stats there is one, which is crucial for every low level dweller. This helps you to: 3) Optimize your future dwellers.

Of course it is similar with lower numbers, but getting 35 dwellers unlocks fitness room for your vault. However, you will free three of your dwellers for other tasks. Moreover, 3 guys with maxed Perception will produce the same amount of water, as 6 guys with 5 P. Your consumption will be the same (if you keep the same number of rooms), so if 6 level 5 P guys were able to supply your vault with water, you will know how much P you want to produce to stay at the same level. Their abilities will be probably quite low so you should steadily make them stronger.

1) It is perfect opportunity to train your dwellers. Why? There are three very good reasons for this. While going forward and increasing population in your vault is, generally speaking, good idea, there is one milestone where you should stop for few days.

Fallout shelter xbox one ghoul dwellers