system
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human
ELI5: Airlines rules against using electronics before 10,000 feet and having your seatback in the upright position for takeoff and landing

So I just got off a flight where something that completely dumbfounded me happened. I sat down in my pre-selected aisle seat on American Airlines and my seatback would recline by a little more than an *inch* when I put weight against it. Before takeoff the flight attendant asked me to bring my seat up and I told her that it wouldn't stay. She made me move seats, *because of that one inch*, to one of the only available middle seats in the back of the plane. She wouldn't even let me go back to the seat when we were in the air. She also got in someobody's face because they tried to hide their phone which was left on. 

So what is the rationale behind these rules? Are the seats so unsafe that if they are reclined they pose an actual risk of injury during takeoff and landing? If electronics are left on do they pose a risk as well? Please ELI5 why we still have these rules and why we haven't been able to come up with better seat and electronic technology.
gpt
1. Takeoffs and landings are the most potentially dangerous parts of the flight. Electronics reduce focus during safety briefings and awareness during the takeoff/landing. Reclined seatbacks and ajar tray tables reduce passenger mobility in the event of an emergency, when the ability to evacuate the plane are of utmost importance.

2. Flight attendants are so adamant about enforcing the rules (even to the point of moving you from a malfunctioning seat) because they can personally be held liable if a passenger does not follow these rules.