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Elon Musk gave the "All-In" podcast a gently self-deprecating review of his tenure at Twitter. He defended his fast decision-making on slashing headcount and putting out new features. But he quipped that it would be "pretty embarrassing and sad" if the moves tanked the site.Elon Musk's time as "Chief Twit" has been marked by apparent snap-of-a-finger changes and sometimes...