So in those situations where a customer moves to another country, etc., the local warranty center would be flexible enough to service a light. Those are rare occasions of relocations you mention.
If that's the case, why bother making a post saying this?
Warranty work for Fenix lights is based on the light's serial number. The serial number is traced to a particular country. So when warranty work is required, the light will have to go back to the country from which the light was purchased.
I understand from your post that Fenix, the manufacturer sets the policy, not you, but it seems like a better policy would be to just restock warranty centers promptly if they run out of service parts. The Fenix lights I've reviewed have all been very solidly built, and I expect them to be reliable for longer than the 5 year warranty period, so I don't expect such an improvement in policy to entail shipping a large volume of service parts. Perhaps you could suggest that to the manufacturer.
I know I would be shocked if I bought a product with distribution centers in multiple parts of the world and the local warranty center wherever I was told me they couldn't fix mine because it came from the wrong place, and I'd probably be disinclined to do business with that company again.