I was clearing out Vault 22 recently, and i found myself wondering, how would my character see the thing, being from the Vault himself and all. Would seeing other failed Vaults make him anxious. How would he even see the life outside having spent most of his life in a Vault.
I mean how would life in a Vault even look like, from the Vault dweller´s perspective the Vault is his entire world, he is born, lives and (probably) dies there, as far as he knows the world outside is completely inhospitable to human life, it may as well be in space(which if we go by the lore, is not at all accidental). What horror must it be to find out about the Vault experiments then, being stuck between staying in a vault and getting exposed with whatever sick twisted idea Vault-tec selected for you, or going out into certain death.
It´s a real horror scenario. Then on the other hand the community that develops in the Vault, it is fascinating to think about, being stuck with only 1000 others, knowing every person by name. Note how in every other Vault NPCs are given generic names, but in Vault 101 every NPC is named. Your character knows this people, they were his family for all intents and purposes, and so every death is not some random "vault dweller". And getting banished, how would that affect the Lone Wanderer? It would be kind of like being disowned by your own family.
To us as players the Vault is just a mildly interesting starting area, but it is so much deeper then that.