I've never been a fan of the "vaults are experiments" thing that was revealed in Fallout 2, but it's not really fair to blame Chris Avellone for that. From what I can tell it was a concept and idea promoted by Tim Cain and other key creators of the setting. Though you can argue that Fallout 1 seems to contradict the idea. According to the Fallout bible Vault 13's experiment was that it wasn't given a spare waterchip, but somehow the first one lasted 90 years? Sure, whatever. So to some degree I think the "experiments" thing was retconned into Fallout 2, but was an idea that Cain and the others came up with. In their minds it contributed to the absurdist humor they wanted to pursue.
You might want to go reread the bibles. The lack of waterchip spares was not a part of the v13 experiment - due to a shipping error they recieved 3 GECKs instead of the 100 Chip shipment which accidently ended up in Vault 8.