I thank you for posting cdb, this has brought awarness on both parties.
That instructing side at busy airports on light helicopters for students and a glimmer of light for atc. Unlike fixed wing, helicopter types have vast differences in operation, and the capacity of a student pilot learning is limited. Atc would not know differences of type of aircraft, and to say different would be completely unfair. Both parties can walk away with something to learn from.
As always keep everything pink and fluffy.