It depends on what your goals for your kids are. It also depends on the quality of screen time. Youtube != Programming != Video gaming != Documentaries != Movie

It depends on what your goals for your kids are. It also depends on the quality of screen time. Youtube != Programming != Video gaming != Documentaries != Movies != TV. Personally, my primary goal for my son is not to make him the best programmer out there. I want him to be a good, happy person first and foremost. If there are things I can do to make him a better programmer that would hurt the chances of him being happy and good, then I will probably prefer instead to hurt his chances of being a good programmer. Screen time is one of those things that I'm somewhat concerned about. Some kids get a lot of it these days. I'm not normally one for fearmongering, but the studies I've seen coming out don't necessarily take a very positive view of its effects.