Where do you draw the line between play-only and learning? My kids go to a preschool where they learn stuff. Writing their name and whatnot. They always have so

Where do you draw the line between play-only and learning? My kids go to a preschool where they learn stuff. Writing their name and whatnot. They always have something to work on, but it's fun for them. I suppose if it ever ceases being fun or becomes stressful for them, I would pull them out.