There is no real skill involved in watching YouTube or even in operating an iPad. Modern gizmos are filled with apps that battle each other for your kids attention and they play on their weaknesses. All the time a kid spends staring at a screen being passive (watching low IQ vloggers praise the latest soda, watch hours of other kids gaming, watch other kids unpack Kinder Eggs, etc) is time spend learning the brain that this is the way to relax. All that time is not spend in social situations, in nature, playing outside, using fine motor skills, learning what is feels like to actually make something of value to yourself or someone else.

A healthy relationship with technology is not that of a consumer in my view, but that exact relation is most profitable to technology producers in this age. Tablets, chromecasts, smartphones and gaming consoles are consumption devices designed to elicit ever more desire to consume. Being a good consumer is not an important part of life imo and that is a message I want to thoroughly imprint on my kids. While they are to young to self regulate I'm right on top of it.