Also consider that sometimes yes, they do need help making the film.
One example is with computer graphics (CG). There are a bunch of great CG companies out there, all of which can make really great visuals for a lot of different things. But one particular area that’s super difficult to make look realistic is big, complicated water simulations.
There’s one studio in particular that’s made quite a name for itself as being the best at these simulations, I think perhaps it was WETA digital. At this point they have a great reputation, a lot of experienced staff, and even special in-house software specifically for this job that other companies can’t access, so if a movie or show demands the absolute best water effects, they may ask this other company to do it even if the ‘main’ effects studio is great at a lot of other things.
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