That's not a counterpoint. The inverse of "shelter too long" is "shelter less long", not "zero shelter ever".

(And the proper way to do "less long" is to slowly loosen up over time.)

There needs to be both things - the opportunity to make mistakes, and the support to make it okay after mistakes are made.

Sounds like you got the first but not the second, which must have been tough. Hope you're doing better now.

12 is the magic number when things start going to shit. I'm sorry for what happened to you but maybe you should start a counselling service for clueless parents and tell them what should they do and what they shouldn't to correctly shelter the children. Because sheltering is an art. I think about it all the time. I always wish some one would take a bit of money but tell me how to guide or not guide my child to be independent in the rough world and to take decisions independently

There's a balance to be struck, it shouldn't be all or nothing.