Okay let’s talk engine design: If the forward fan loses a blade, the brown casing that surrounds it is designed to catch any debris without a breach. If parts of the core fail, the casing isn’t designed for containment because of the incredible internal energy.
https://twitter.com/michaelagiulia/status/1363241125495136267
What engine designers do is they engineer out (as best as possible) the possible causes of failure. Clearly whatever befell this engine had tremendous energy involved given the near-total disintegration of the nacelle.
Also, before takeoff while all the passengers are getting settled, the crew is preparing for this very scenario. U.S. airline SOP (and the vast majority around the world) is a detailed takeoff briefing that directly addresses engine failure and what comes next to get home safely.
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