The Vault Tec reveal, if it's the one I'm thinking of, has been a fan theory for decades. And Vault 31 made perfect sense? At least if you think like Vault Tec. It was really one of those "wow, of course Vault Tec would do that!" moments for me.
It's fine as a fan theory. It makes sense. It just doesn't seem like the sort of thing protagonists or the viewer should ever actually know.
As well as the bomb thing, I'd much prefer buds buds being something created by scientists in an early vault 31 generation who then manipulate 32 and 33.
The world before should remain strange and unknowable. I much prefer the pov in fallout remaining limited. I don't like knowing the idiots who created it all.