Some kids are “screen zombies” – if there is a screen on they are attached do it. These are the children who do need limits on their screen time.
But what about the kids who aren’t screen zombies? Instead of limiting their time, monitor what they watch. There is A LOT for toddlers to learn from Preschool shows like Paw Patrol, Peppa Pig, Blaze and the Monster Machines, as well as wonderful videos on YouTube for proper hygiene, potty training, using your manners, and learning all sorts of languages. My daughters are particularly fond of Spanish & Korean videos.
Plus there are apps galore where kids learn spelling, reading, and math while having fun!