It may sound strange but I think the best thing is for someone to overcome their fears as much as possible and be able to accept things not going as they plan. It'd be nice if they could control their emotions and not pass on drama to others, but that's why I talk about overcoming fear, a lot of that drama comes from fear.
I have seen very few true adults, although I think it is changing.
But I don't think it could ever be perfect so it's ok that there are these problems as long as they can improve over time.