It's only as useless, as, say, the crew on a film, or even a highly-paid footballer. If these people didn't do their tiny part, the entertainment industry wouldn't rake in as much cash.
You are so right. I've been saying my whole life that if animators would just make their characters bald, the manhours we would recoup as a species would be truly transformative.
If you are going by that definition of "wouldn't matter" then it probably holds for all movies. And lots of other enjoyable stuff. Not a very useful definition.
I'm not saying entertainment is meaningless, I'm merely objecting to the claim that "it has to get done." No, it doesn't. It's not mandatory, it's a luxury.
Getting paid to satisfy others' frivolous pursuits is the future of work. With more real-world work being automated away, we'd better hope there are jobs like "World of Warcraft Concierge" and "Sim City Colorist." All the "honest day's labor" jobs are evaporating.