A lot of this has to do with the mindset towards regulations.....
It was explained to me by a German Airbus test pilot thus:
A Brit, a German and a Frenchman all receive a new aircraft type. Each decides they want to use it for a specific purpose.
The Brit checks the manual - if there's nothing stating that he can't do it, then he'll go ahead and do it.
The German checks the manual - if there's nothing saying that he can do it, then he won't do it.
The Frenchman merely says "What manual?".........
So unless there's a specific rating privilege stating "The holder may give IF instruction to any other pilot" or similar, a German simply won't do it.
This isn't some racist nonsense, it's a consequence of different types of legal systems. One needs rules for everything, the other only has rules for prohibition.