We use screen time only when we're eating a meal outside. It gives us peace to eat and finish our meal.
But at home, our daughter does watch a lot of youtube (via TV) since I work from home and cannot entertain her the entire time. She has learned a lot form YT due to the repetition of shows. Example: When she was just over 1 year old, she was counting to 50 without us teaching her because she would watch a show called Number Blocks.A boy who she plays with is the same age and is only counting to 2. I told his grandparents about the show and in 1 week, he's counting to 10. They thanked me.
But at the same time her doc told us no slot machine vids on YT due to the higher risk of ADD. The brain will crave that fast stimulation (wheels spinning), which may lead to a higher risk of it.
Our daughter also never demands her tablet at home either. Screen time IMO, limited helps parents "relax" when doing a task. Yes, my parents never had this advantage, but with technology, changes come. I have seen other kids when out demand their tablet and stuff.