Vinegar is an acid. There's a ton of replacement o-rings out there that were bought on the cheap by the person replacing the o-rings. Many o-ring materials swell when exposed to acid. Viton and Nitrile (Buna-N) o-rings are most commonly used by manufacturers of rdas and the like, because of their good temp ratings and resistance to a wide range of ph values, along with other things.
Some knotheads buy polyacrylate, fluorosilicone, or whatever's cheapest on the list and can handle the heat. Then, they're sad when the juice causes them to swell, because they scratch up their pretty rda or break the glass on their rta trying to get the cap back off.
Worse, some cinnamon-type flavors and the like munch down on the generic material of their "great deal" o-rings, and they don't know they're vaping the byproducts until the cap falls off or the tank drools all over them.
They're vaping a chemical concoction and don't even know it, perhaps for weeks.
Anyway... KNOW your o-ring material. I don't buy used tanks and such, but if I did, I'd replace all o-rings.
I Agree with what you Said. But I will add this...
You do All the Research You Want, and Cross-reference all the Technical Specs, But if you Aren't Buying an O-Ring from a Trusted Source, many times you're just Buying a Black O-Ring.
O-rings are a Lot like Batteries. Lots of People Sell them. But it can be Hard to Know what you are actually Buying.