They have a short attention span and lack patience. They were born in an era of high speed internet, mobile access to the internet, and the constant barrage of social media clickbait short videos.
They don't know what it's like to be offline for a while during trhe day, or even an entire day. And when they're offline engaging in activities, they feel the need to document everything with photos and videos and then upload them to social media.
If you take away their phones for a day, their withdrawal syndrome might be very similar to a drug addict at a halfway house.