Interesting read. I was especially intrigued by the Ti part as that is relevant to what I have been experiencing lately. I confined myself to hell (INTJ Central) for several weeks in order to learn how to justify my ideas with reasoning or until I was banned. I learned a tremendous deal about equivocation, logical fallacies, distortion of information, arbitrary redefinition, and countless forms of rhetoric. The benefit to such is that I don't fall to such things and can now form coherent arguments based on sound reasoning. As evidence of this, I accidentally recreated Kant's Transcendental Idealism even though I had never been exposed to the concept. I'm also no longer reliant on others accepting my ideas.
The downside to learning to evoke my Ti is that it doesn't couple well with my Fe. I now have no patience whatsoever for those who utilize less than intelligent techniques in debate such as emotional appeal or any of the above mentioned, and I find it personally offensive that they would compromise the integrity of the discussion by doing so. This has actually lead me to feel intellectually superior and dominating to others and it is a feeling which I find terrifying. I would prefer that people understood my idea rather than dominating and embarrassing them in discussion, but my own personal prejudices and preconceptions seem to come out and it makes the discussion anything but amiable. So in that sense I disagree with the development of the Ti. INFJs have to be emotionally mature to use it amiably, otherwise it becomes self destructive.