Also another reason small groups are vulnerable after shft, what if is a longer healing injury? Or worse a permanent disabling it can put your small group survival at risk.
Whirlibird has done his best to prepare but there is ALWAYS random events that can not be for seen. Sometimes you just need more people. Keeping animals is one. How can we feed this many animals over winter? Even if land is all set not needing clearing planting weeding and harvesting are super labor intensive expecially with no fuel. What happens if this would happen at harvest and you lose 2 people?