If someone said to me: "you can either work in an Amazon warehouse (either shift 7.00am-5.30pm or 5.45pm-4.15am) or be the CEO of Amazon but you're going to get paid the same whichever you choose" I know which I'd do.
I think you are misinterpreting what 'hard' means.
That makes it volatile, not hard. And the stakes are much less for volatility when you already have several cool million in the bank...
The CEO of an Ambulance company I know has about 500 staff, he's been doing it for 25 years, it all seems like a smooth operation but they're constantly facing issues. Labour and training problems, international actors that won't pay and their governments won't help, shipping problems, supply chain problems. Liability issues. IP issues with some special things they do. Orders come in batches, they might have a down year and possibly have to play people off. And I'm not even getting into the very basics of product development, financing the working capital i.e. the regular stuff employees do.
People who think CEO's just show up and wear suits and have meetings, and kiss up to the board ... I don't think have any exposure to what the job entails.
A CEO compared is a walk in the park. All those issues you've mentioned ("Labour and training problems, international actors that won't pay and their governments won't help, shipping problems, supply chain problems") are there in any business (even in a single person shop).
If you can avoid that, it must be a great job. Massive pay, no labor, people do what you say, and if you screw up the politics and get fired you’re still set for life.
The implications of this are not great.