Hollywood is notoriously resistant to change. You can blame at least some of that on the fact that every movie written for the last 20 years or so has followed the guidelines set forth in a single book.

Amazon.com

The official Bible of every waiter in Los Angeles.

It's called Save the Cat, and if you've never read it, the general premise is that you're stupid if you don't give away the entire ending to your film in the first 10 minutes. This is exactly the kind of thing that makes Hollywood the bland (albeit explosion-riddled), formulaic mess that it mostly is today. If something worked in the past, they'll just keep doing it, no matter how injurious it may be to the overall quality of the project (or your willingness to ever stop shopping exclusively on The Pirate Bay).