But I see your point about how the desire to have things settled would lead kind of naturally to not wanting to rehash old decisions. So many people questions their type, though, regardless of whether they are P or J. As such, it is my hunch that type theory isn't something that many people can be absolutely sure about at all.
And let me just take this opportunity to voice my total disappointment in Keirsey's Please Understand Me II. Seriously, it's nothing more than an incredibly repetitive and long version of the information already on the website. I thought there was at least going to be something new in there somewhere.