Because of the higher requirements to remove sprout status there is more likely you end up inviting a player that doesn't need most of this guidance and just wants to abuse this system for content carry.So have no interest in the chat.
But in general anyway i think we should design the novice network system differently.Make it like party finder.A person has x question and mentors can join the chat room to help advice on that situation.And if novices want they can also enter to see the advice as it may help them too.
I don't think the chat system works well currently.I have to turn it off a lot if in an instance because i just can't answer stuff when tanking etc