I can't imagine how hard it must be to manage a company as big and complex as YouTube.
To be fair, not at all. Someone in her position would be making broad decisions, such as “should we have a downvote button,” and spending her time courting advertisers and handling the whiny board of directors, who are mostly geriatric babies.
These are billionaire CEOs, not artists. There’s nothing particularly mysterious about their work, which you can learn all about from the many, many self-fellating autobiographies their ghost writers churn out every year.