Roblox has a powerful set of parental controls that keep growing, however they are cemented around the idea of friendship. Ironically, parental controls are very weak around friendships.
Roblox should add a setting which would require a parent pin to be inputted for a friend request to be accepted or sent. This would allow parents to better trust Roblox since it means that a child would be unable to bypass parental controls set to friends-only by friending strangers.