How is it logical to put a 'No aerobatics' restriction on an FI rating when the rating does not include the privilege in the first place?
You will recall that this has nothing whatsoever to do with the JAA, it is a left over from the UK National rating when ratings had limitations placed on them until they were removed. The No Night, and No applied IF, are exactly the same and not in accordance with JAR-FCL. It is never the less a limitation, even the JAR-FCL definition of the word Rating refers to such limitations. I don't disagree that its a nonsense, but it is a limitation and if you had an accident whilst teaching aerobatics I am sure the Insurer would find it a convenient limitation to apply and opt out of any liability.