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Not sure about your opening thesis. The vast majority of employees work for privately held businesses and from personal experience of working in such companies, “management” by OKRs and the like is common in companies who are not listed on stock markets also.

There'll inevitably be cargo culting driven by MBA curriculums and "they're making a lot of money, let's do what they did" without examining the specifics of the situation to distinguish luck from judgement.

We need to appoint people who really CARE. When CEOs hop from company to company, the culture of CARING takes a backseat. Everything becomes transient with no one with deep technical or cultural knowledge at the driving seat. This is the reason people who have been at the company for long time should get a chance to transform it from within like Satya Nadella.

OKRs took off after a VC named John Doerr introduced them to Google, and the industry followed their lead. https://www.whatmatters.com/