Normal functioning holds back XIIs - reservations are and will be forever present. They are relativistic in perception and usually attempt to plan for all possible contingencies (what-ifs) rather than immediately limit their rationalization to the facts at hand. EIIs are further hampered by a tendency to keep a lot of personal things unresolved perhaps erroneously thinking that the perceived problems will eventually go away by themselves. This reticence seems to diminish with experience and confidence when they experience some measure of success because without it, they can easily go into delay-forever mode.....

a.k.a. I/O