Screen time should be limited to one hour per day
Secondly, it is causing young people to have unhealthy lifestyles. Surely you'd want to be the picture of health and a strong and robust individual? If young people spent less time on their screens and more time being fit and healthy outside, many people would feel a lot more rejuvenated and healthy.
Lastly, time is too precious. You have one childhood. Screen time is limitless. Surely, you'd want to be out living your life and making lots of jovial memories? You will have some of your most superior memories as a child, so best enjoy them NOW. Will you really remember spending all that time on a screen?