AIBU to stay with a young child doing an activity?

[HRMumness]

I took my (almost) 3 year old girl to her first dance class today. It's for 3-5 year olds and the class runs for an hour. People running the class seem friendly and have no complaints but after we arrived and did some admin, they led my daughter away to the class and said that parents were to wait outside the class.

AIBU to expect that parents would have the option of being able to watch and keep an eye on how a very young child is doing at an activity or is this the norm for certain activities?

We are invited to watch the last class of term but otherwise it's a closed door. Doesn't bother me as I still get to hear about what they've done afterwards and see their progress.

I would only have an issue if I felt something untoward was going on...

drspouse- I don't think silvercat suggested that 3 year olds are disciplined. But even at 3 children can start to learn some of the (huge ) amount of discipline that ballet demands.