That word count made the piece about one-tenth the length of the average novel—and 10x his article on Personal Superintelligence a year ago.

And Zuckerberg is not alone: Anthropic CEO Dario Amodei delivered the longest piece in this genre so far in 2024 with his 13,000-word “Machines of Loving Grace” essay, while Nvidia’s Jensen Huang has also joined in, as have other AI CEOs. The official explanation is high-minded: with Wall Street scrutinizing Meta’s tens of billions in spending and rival labs racing for dominance, these founders want to lay out their vision in exacting detail and bring regulators and the public along. As Columbia Business School professor Dan Wang told me, “They have to draw the boundaries around why AI can be useful even before they begin selling products.”

But there’s a less flattering read, and communications specialist Patrick Riccards put it best. “CEOs, particularly tech CEOs, believe that their words are gospel,” he told me. These essays, he says, are flags planted in the ground: “You essentially have five or six tech CEOs that are trying to demonstrate whose…[shall we say essay] is bigger.” In our era of short attention spans, that raises an obvious problem. Do people other than AI titans even read these? And if not, what’s the point?

For a model of what leadership via long form can actually look like, it’s useful to examine the master of the genre. Warren Buffett went long in his annual letters to Berkshire Hathaway shareholders—often 10,000-plus words, deep on the year’s lessons and the company’s results, sprinkled with folksy wisdom. But the length was never the point. Buffett wrote to be understood by anyone; he famously drafted his letters as if explaining the business to his own sisters, smart people who happened to be outside finance. People didn’t read him because he wrote a lot. They read him because he’d earned the right to be heard, over decades of results, and then chose to be plain about it. (His successor Greg Abel’s first letter as CEO this year followed that tradition.)

And there’s the distinction. Buffett knew exactly who his readers were. Zuckerberg, Amodei and the rest are writing to each other—a closed loop of founders, investors and the reporters who cover them, each essay answering the last. But is that the right audience? Zuckerberg is facing heat from the public, who are wary of data centers in their communities and low on trust for Big Tech. A 6,500-word manifesto seems unlikely to change their minds. If there’s one lesson any CEO can take from Buffett, it’s that the writing is easy—earning the right to be read is the hard part.

Contact CEO Daily via Diane Brady at diane.brady@fortune.com

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CEO Daily is curated and edited by Joseph Abrams, Jason Ma, Claire Zillman, and Lee Clifford.