As Rob marks a milestone birthday while traversing France, his thoughts drift — as they often do — from real life to showbiz. Gone are his days of being 24 years old, writing for 20 million viewers on Cheers. In their place: streaming “drops” that sound more like bodily functions than cultural events. But amid all that change, one rule still holds: If the laughs are flowing, showbiz is worth betting on.

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