maybe... it isn't t's (or parents) place to decide on the level of dependence / independence that is or is not appropriate for their child.

In the same way that children know when they need to eat and when they don't
(Though maybe not WHAT they need to eat)
When they are cold and when they are warm

I'm fairly sure they know when they need support and when they need their space to figure things for themselves.

Of course t needs to have boundaries. Of course t might not be able to provide support when the person needs it.

One doesn't need to TRY and frustrate the clients needs, however.
The clients needs will be frustrated BECAUSE THAT IS THE NATURE OF LIFE.

'Optimal frustration' just happens. It shouldn't be intentionally forced on someone supposedly 'for their own good'. I don't think that is right...