system
Given the following post, respond as if you're commenting on Reddit:
human
Why must we turn off all electronics while on a flight? 

In fact, why do we have our tray tables up? What would a seatbelt do at that speed? Why does 3 inches of incline matter? 

Shouldn't our comfort matter more?

Explain this to me like I'm five.
gpt
If anything goes wrong on a plane, there's a good chance it's going to happen during take-off or landing.  You have to turn off your electronics so that - if anything does go wrong - you'll be able to hear the pilot or flight attendants give you instructions.

Your tray table is up so you can stand up and get out of the row easily when you need to evacuate.  Same for putting the seat up.

The seatbelt keeps you in your seat in case the plane hits turbulence.  It's not going to do squat if you hit a mountain, but if the plane drops 50 feet in an air pocket and you don't have your seatbelt on, your head is hitting the ceiling - hard.

Your comfort matters, but I'd rather be uncomfortable than dead.