It's a canard to think that you must use an electronic device for everything productive. A computer is a doing machine, not a thinking machine.
Your best thoughts happen when you're disconnected, in the shower or on a walk. They also happen when you slow down, pen in hand letting each idea match the pace of the ink.
“A good idea doesn’t come when you’re doing a million things. The good idea comes in the moment of rest. It comes in the shower. It comes when you’re doodling or playing trains with your son. It’s when your mind is on the other side of things.” — Lin Manuel Miranda
Human beings aren't meant to operate in high gear for long periods of time.
There's a reason commas exist. They prompt intentional interruptions to bring you back down to earth in a mental pace that's more tortoise-y and less hareish.
The obsession with speed is self-defeating. It thinks without thinking, aiming for security that leaves you more emotionally insecure.
Permit your reptilian brain to breathe into your inner experiences. The key to security is the freedom to be insecure, to live and let go, even if that means doing nothing but float at any moment. The best device is the rest.