Any actual reasons or are we limiting them just because?
Just because they aren’t ready to make informed decisions, yes. If they were ready, they’d be called adults.
My parents were sure that sitting too close to a TV ruined your eyesight. Should we get a law that forces people to sit at least X meters from the TV?
It is children’s freedoms that ought to be restricted. Not their parents’. If you don’t understand the difference, that’s a problem.