I haven't read the thread; I'll just respond to this one point.
In PUM II, Keirsey revised that passage to read: "Counselors [INFJs] make outstanding individual therapists who have a unique ability to get in touch with their patients' inner lives, though they are also the most vulnerable of all the types to the
eruption of their own repressed thoughts and feelings.".
I take that to meant that they get caught by surprise when their own Superego or Id aspect comes bubbling up to the surface under stress. (See the thread
http://www.typologycentral.com/forums/other-psychology-topics/4013-id-ego-super-ego.html ). I once saw an INFJ boss break into a rage and then almost instantly into tears and helplessness simply because one of his subordinates disagreed with him on how to handle a minor problem. (I assume the INFJ was severely stressed in his personal life, to have fallen apart so spectacularly and publicly over a minor problem.)
Anyway, I'm no expert on INFJs. But INFJs seem so reserved and "together," that it may be a big point of shame for them when they lose it under stress.
It also makes me doubt the practicability of such sentiments from an INFJ as "My soulmate should be able to understand everything about me." Frankly, I'm not sure even INFJs themselves really understand themselves all that well. They seem terribly caught by surprise and ashamed when their facade crumbles under stress.
Hence, I tend to take the position that it's healthy for all types to recognize and integrate their lesser functions (and become well-rounded, whole individuals), rather than just try to cling to their Dominant (and try to live up to an ideal but incomplete image of themselves).
Just my own opinion, of course. A controversial and not necessarily flattering opinion, I know.