Why Is That Actors Take Up Assistant Director's Job Before Foraying Into Acting?

With the news of Ibrahim Ali Khan making his Bollywood debut not being in front of the camera but behind the lens, that is assisting Karan Johar in his upcoming film. As so you know he is not the first star to be doing this, usually I have seen this pattern with almost all the star kids.

They take up the job of being assistant directors to some amazing filmmakers like for example Varun Dhawan, Ranbir Kapoor, Sonam Kapoor, Arjun Kapoor, Ishaan Khattar and also Shanaya Kapoor who will be making her big Bollywood debut next year.

Why is it that they start from the level of AD, is it because being on the other side of the camera can actually be a big learning curve for actors? Because clearly, these star kids are making good use of the resources available to them, whether it is helping them or not is altogether a different story!