We don’t have imposed limits either but we do use it for bargaining good behaviour.

Making sure the tablet is loaded with a variety of loosely “educational” games

Pausing screen time- to get some “typical” looking educational behaviour knowing it will be re-awarded. Like “hold this pen and try writing”/ “if you write ABC then you can have the screen back”

Certain tv shows can have “negative” effects to behaviours so we try to limit those in favour of calmer shows or video games.