It’s like how music has a lot of songs that go 1-3-5 in terms of chord progression. Overtime people just discovered that that’s an extremely effective story telling method. The first movie generally acts as an introduction, the second as a build up and the third as a climax / resolution. Going longer than that is just where you’ll usually start to lose people. You’d in many cases be better off starting a new trilogy in that case or just doing multiple separate movie industries kind like the Harry Potter movies. That way each movie sort of stands on it’s own and isn’t too heavily link to the other movies despite them all together forming a a bigger picture.
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