So, you're saying that if you're skilled it'll look pretty and if you're not, it'll look like garbage? No, thats not what I'm saying. For the sake of the movie, of course its going to look good. If it was poor acting, poor quality, it'll get poor reviews, and wont make any money.
Fact is, in real life, we won't know what the badguy is throwing at us, how he'll attack us, if there will be weapons, etc.
When I do spontaneous reaction drills with my techs., I have no idea what the other person is throwing. My goal is to defend myself. I'm not trying to impress someone with a flashy technique, I'm trying to avoid getting hit, and counter attacking. I dont care if it doesnt look picture perfect, I care about whether or not I get hit.