An interesting thing is your 2nd narrative (e.g. kids aren't computer literate because interfaces are so simple) has actually had a knock on effect to non computer skills.
For example, they noticed 5 years ago that childrens ability to pick up writing skills (fine motor skills with a pencil) was diminishing. At the same time, the school had purchased a bunch of tablet computers. They noticed kids could easily point a finger. And have since done a survey each year with parents to assess how many kids have tablets at home.
Year in year, the ability for children to learn to use a pencil has diminished, and the number of kids with tablets at home has increased.
In summary, simplified computer interfaces have made kids/parents lazy in developing fine motor skills and it's affected their ability to learn to write.