He's there to maintain the very unique culture of the company. I think it's sort of like if they have his son there he of all people should know Buffett's/Berkshire's culture and be able to best maintain it. He's got a few years to figure out a successor. But yeah this is mostly about the unique culture they have.

I thought he was giving away 99% of his wealth?

> but to oversee their family's share in the enterprise

Not exactly, he's there to oversee the culture of Berkshire and ensure it's continuity. Buffett is donating all of his wealth (and has already donated $66B), so there isn't a fortune to protect.

Berkshire is an institution of sorts at this point, and requires strong stewardship to prevent enshittification (for lack of a better word).