“Can you even imagine how weird it is to come home after a long day and hear yourself welcome you and offer you a seat in your own house?”
I was making fun of the show when I read an interview that said they created an origin for Vault Boy. But I think they actually nailed it. It makes you look at the thumbs up image in a darker way, which is perfect for Fallout. And it didn’t seem shoehorned in.
The thumbs up thing has been implied in the lore for a long time. All they did was attach a specific person to it.