That's my main problem with all this "screen time is bad" stuff.
There's a huge difference between a kid spending 2 hours playing Flappy Bird and spending 2 hours playing with an educational app, or drawing/painting in an app, or watching tutorials on YouTube.
It's like saying "time at the park is bad for you" because some kids go to the park to smoke cigarettes and drink alcohol.
Screen time isn't bad for kids. Parents not controlling what kids DO on the screens is bad for kids. It's all just another convenient thing for parents to point at and blame for their lazy parenting.
Moderate what your kids do, push them towards using screens and technology in educational and beneficial ways that stimulate their imagination and creativity, control the amount of time they spend sedentary, and teach them that like all things in life, balance and variety are important.
(Parent of 2 kids, who get unlimited access to TV, game consoles, and a tablet, and would much rather play Lego)