I think actors need science knowledge or maths to do stunts. Even Jackie Chan needs to use maths when he jumps off a building or climbs a tree, don't you think;)? Singers use lights to look better on scenes, sound-, smoke-, and fire effects. I think it's science. But maybe I should have put those examples in the text to strengthen my arguments.
:D
You are very good with counter arguments.... Well, what I meant was that particular line sounds like a too much generalization. It's a compliment that the actors have a good knowledge in math and science, but they can manage doing a good job without having such knowledge. Those effects you talk about can be handled by specialized guys in their production team and not necessarily by the person who performs. Generally those guys hire expertise :D
I guess you are preparing for IELTS or TOEFL. Then pay attention to their expected essay structures. I think the 4 para (Intro+2 Body paras +Conclusion) structure is the best for you to earn good marks.
Anyways, you write very well :)