Clarified.

I have determined that the coming of the subconscious functions into conscious polarity with their contraries is a two-way affair: the conscious function (always of the ego or the super-ego blocks) receives information from the subconscious function (always of the superid or id blocks) that is needed for an optimal choice of observations, in return for its assistance to the subconscious function on behalf of the unconscious' own needs for optimal content.

The character of these relationships is discussed in brief below.

to : A sequence of events is accepted or produced in service to
the acceptance or production of an as-yet impossible occurance.

to : A possibility is accepted or produced in service to the acceptance
or production of an as-yet impossible sequence of events.

to : A structure is accepted or produced on behalf of the acceptance
or production of an as-yet unapprehended link between objects.

to : Communication or knowledge is accepted or produced on behalf of
the acceptance or production of an as-yet unrecognized heiarchy or complex.

to : An interrelation is accepted or produced on behalf of the
acceptance or production of an as-yet unobserved force.

to : A force is accepted or produced on behalf of the acceptance or
production of an as-yet unapphrended interrelationship.

to : A feeling motive is accepted or produced on behalf of the
acceptance or production of a viewpoint or perception of which one is unaware.

to : A viewpoint or perception is accepted or produced in service to
the acceptance or production of an as-yet uncultivated feeling motive.
Although the functions would prefer ignorance of their contrary's input, the fact remains that they need a "tightening of the vise" that only their contrary can provide. The question is, "whom does the grail serve"? When to tighten the vise and when not to is determined by the ego itself. (I say this from my own experience) The ego (or superego, if the receiving conscious function is located in the ego block) must choose whether or not to allow the id (or super-id) to provide information of its own as a base for the conscious function's considerations, keeping in mind that the id will desire some return compensation. If one is unconfident in one's own ability to choose the best option from those offered, then the subconscious can provide an id-centric critique of each option's relevance. Although the id is damaged due to the objective awareness of its intentions manifest in the nature of the ego's choice, it may be compensated by the ego through a suitable adjustment of the id's condition to the objective situation.

The question as to whether we allow ourselves the assistance of our id, then, is... do we feel confident in our ability to undo the damage to ourselves?