Some of that has to do with the stars famously deliberate approach to his work.
Hes not lazy, hes just a chronic second-guesser.
Another reason for those long fallow stretches, though, is due to Beattys political activism.

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But that never stopped him from reaching across the aisle when it came to friendships.
Take his personal connection with Ronald Reagan.
It was an honor, of course.
But a slightly awkward one.
Reagan was hardly the ideal audience for it.
He was talking about the performance of it.
Recalling this, Beatty laughs.
I was quite friendly with Ronald Reagan.
I didnt agree with him, but I liked him very much.
Redsdid turn out to have a happy ending, though.
But despite its success, the film was next to impossible to get financed.
Even for one of Hollywoods biggest stars who was coming off two consecutive box-office hits.
Says Beatty, Heaven Can Waitmade a ton of money.
AndShampoohad been a big hit.
Im thinking: This is the time to make this movie that otherwise couldnt get made.
Just dont make this movie!
And I said, Im sorry, but Im going to make it.
And they stepped up to the plate.