It can be a mixed blessing, BUT very much depends who answers the phone.
I recently had a 6-monthly medical restriction put on my certificate. Why, I wondered. Called and was told that under Annexx xx, Clause b(i)x they could do this. Yes, why? Read the above Annex. Yes, why?...... I'll have to refer this [to the supervisor].
Problem she says? No, just wanna know WHY? Oh, is that all; you're over 60. Ask your mates, they'll tell you. OK, ta!
So, it depends who you get. I've had great success with going to the top where required, although time may not be of the essence.
G'day