This is an aside from the Heinz nonsense, and a bit of nerding out.

But even a fantasy world will have an internal logic. I.e, if someone showed up in LOTR with machine guns, fighter jets and stealth bombers, that would be a serious WTF? and a valid problem with the existing internal logic of that world.

In general I agree that the landscape lends itself to a lot of "go with it", just pointing out that an internal logic still exists.

Far as Heinz and his HOTD bit, it's nonsense for the reasons you, myself, and others have explained.