I think shielding for me is mostly to protect something that feels foreign or "scary". Once you experience different feelings it is no longer something you necessarily throw up a shield for.. If I may put it like that. I wonder if healers need to work through this in order to use their healing abilities to their fullest.. or is it something they can simply do. Good questions..
I think for me grounding is far more important most of the time. In my mind I need to control what is going on with me before anything else. Many times it feels like I am putting up that boundary around myself to protect others.. not to block them from me.
Taking in information through absorbing to interpret what it is? Do you feel you are a healer?