It all comes down to safety.
Why You Have To Close Your Tray Table During Takeoff & Landing - Your Mileage May Vary
English for Flight Attendants: 60+ Words and Phrases You Should Know [with Audio]
A Flight Attendant Explains When You Should — and Shouldn't — Use the Call Button
5 Buttons You Hope Your Pilot Never Has to Push
21 ways to make your economy class seat more comfortable while flying
Why must your seat be in the upright position, belongings under your seat, window shades up, & lights dimmed before take-off or landing of a plane? - Quora
The Real Reason Flight Attendants Don't Want to Help You Stow Your Luggage
Why You Should Never Sleep Through Takeoff or Landing
How to Get the Best Seats on a Plane - Next Vacay
Why does it matter if my tray table is stowed and my seat is up for take off and landing? : r/NoStupidQuestions
Why do flight attendants instruct passengers to keep their seats upright, tray tables closed, and window shades opened during take off and landing? - Quora
What Happens When You Don't Turn Off Your Cell Phone on a Plane?
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Exploring the World's Biggest Airplane, the Antonov 225 Myria
5 Buttons You Hope Your Pilot Never Has to Push