Elon walked off stage to kill the guy who designed the glass.
As a CEO that is particularly overly in control, ultimately he'll decide how to present, when to present, what to present. It's a take it or leave it package, Musk is a very abnormal executive. He'll rehearse slides if he feels like it, that's clearly more like his personality.
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I trust the glass will be fully bulletproof by end of year, if not some time next week.