[MENTION=19948]Showbread[/MENTION] tagging to remind you that you wanted to post.
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Now that I have time to write this out. Much of what was already talked about was how inferior Ti manifests externally, but I want to focus on the internal experience of it, as that's ultimately what matters more, and what is less understood.
Inferior Ti is very... devoid. It's devoid of care, it's devoid of drive, it's devoid of feeling, it's devoid of positivity, and it's devoid of hope. It simply runs off cold hard "facts" of life, that incidentally are negative.
Fe is very driven. I have yet to meet an Fe-dom who isn't driven towards something. A goal, an ideal, a person, something. Fe will find purpose and meaning within something(s) and sort of base it's life around it. It might not be logical, or even practical, but it gives purpose and meaning towards doing what it does and living life. When those goals or ideals are not met, can not be met, or the ends to them are poor, it hurts pretty darn bad. Fe gets forced to analyze "what went wrong", and most of the time that works out alright. It will recalibrate it's methods and try again. It certainly doesn't want to give up. It still hurts, but for the sake of the goals it keeps going. Except when it "runs out".
It's not uncommon for Fe to create "axioms". Hard and fast truths and conditions that are assumed to be met or required. These aren't wantonly chosen, but carefully thought out and made to seem unbreakable. The vast majority these are right, but like everything nothing is fullproof. Fe does not suffer well when these axioms are broken. Say for example, someones life plan hinges on making a set amount of money. That income is deemed an "axiom", a requirement assumed will be met and should not be a problem. There could be many reason to why it needs to be made; afford to support kids and a family, pay off loans, buy a dream house, etc. all the same it's a lynchpin. If something happens in ones life that breaks this assumed axion, Fe breaks as well. The best laid plans and goals fall to dissaray as the axiom broke, and it requires working it out from the ground up. If there is no good, easy, or fast solution inferior Ti steps in, and if it can't sort it out, it becomes dysfunctional.
Inferior Ti tends to focus on the negative and hit "what's the point..." moments quite easily. As an extreme example, but one I've experienced personally (and other Fe doms I know have as well), but "what's even the point of living? We're all going to die anyway". Inferior Ti brings forwards all of the cold realities of life. They're effectively axioms as well: life is finite, the universe is finite, nothing lasts. In the grip of inferior Ti, I have experienced immense pain over focusing on the state of the world. In one particular instance, I found myself looping and stressing over the fact that rare earth metals will eventually run out in the earth, maybe even in our lifetime. There is currently no solution for this, and our modern world requires these for significant portions of our technology. Are these thoughts productive? Nope. Inferior Ti can even be aware that these are non-productive, but it doesn't care. Inferior Ti often gets focused on the state of the world, the state of your life, and only focuses on the simple negative facts. Since plans and axioms "broke", it's as if the only thing that matters now is the way things are broken, fundemenally, that can't be changed.
Inferior Ti convinces itself that it's being immensely rational at all times, but it really isn't. The problem is it condenses logic and reality into very dense points. It ignores nuance like the plague. A lot of it driven from the fact that Fe runs off a lot of nuance to lay out its drives and goals. Ti supplements this and it gets "tired" when in the grip. It's a dysfunctional desire for a simple solution. This can manifest in grand large scale things, or even the tiniest minutia. It all sounds a lot like clinical depression, and it can be, but's not required.
It's odd, even while in the experience of this all with inferior Ti, moments of happiness and peace can be acheived. One doesn't need to be depressed. The individual can still function, experience happiness, but progress screaches to a halt. Things are often run off auto pilot. Inferior Ti thinks, but it truly doesn't want to think. It simply churns out "this is a fact", statements, axioms, that are done verbatium without further consideration. It can almost be like witnessing yourself experience things without actually experiencing it yourself.
Anyway, I think that covers the gist of how I see it.