Delta quadra consists of STs and NFs.

STs are not psychologically inclined people by nature, so they won't be as confident as other types about the mental wanderings regarding their own type. In typology they're not faring into their natural environment.

NFs are psychologically oriented but they are not the most confident and tend to need reassurance. Reassurance which they won't:
-get from their duals or activity partners, since delta STs are not oriented to such a subject;
-accept from all the others, since due to their own strong intuition and feeling they'll recognize the psychological limitations of their reasonings and/or they won't like the way those other types communicate and express their opinions.

Their beta counterparts tend to have an easier experience in typology since Ni is convergent by nature, while the beta STs also have the bonus of usually having high confidence due to their assertiveness, so they'll more readily express their opinions on a subject which isn't exactly in their area of expertise.

Delta NFs have the gift of seeing the complexity of psychological typology but the curse of being irresolute. They will more easily jump to conclusions on subjects they don't see as precisely.
Delta STs don't see the psychological complexities but are conscious about their own limits and think the possible interpretations of their type are too many to just bet on the most likely, due to the divergent nature of their own Ne.