To be honest, I personally like one thing about the western countries that once their child turns 18, the parents encourage the child to live on his own.
So the child eventually has to earn on his own and pay his own bills and does what he wants to do.
May be this is something I will try on my child too when he turns 18.
Parent should encourage their kid to be independent which doesn't mean they should be separated but also you are saying is truth, we could not act independently all the time while we are living with parents and it's only possible when they trust our judgment completely and take the risk if there is and we can't blame them for it because they are being conservative though.