I imagine from what I read about Steve Jobs, Elon Musk and Jensen Huang is that all three of them have/had unconventional management style in the sense that they're often amongst the IC's. Obviously you can't do that with all of your 30.000 employees, but I think they're just picking the teams that are most crucial at a certain point.

For example if Steve Jobs is managing Apple while launching the iPhone, I imagine he's talking to the VP of Sales in the management meetings, but he's not on the sales floor, nor is he sitting with MacOS dev teams or making sure motivations are high in the customer service department. But I bet you could find him in weekly iPhone design team meetings, and maybe he'd be shown progress on iOS every month and have a 3-hour brainstorm with a core team of senior devs on that team. Maybe they'd pull him into procurement meetings to make sure the capacitative touch screens would be made in the quantity they needed.

You'd have your VP's, directors and senior management making sure the ship sails, but you'd have the founder CEO present where they can have most impact, which just isn't in those top level meetings.