Everything you described (which is really behavior) can be true for the INFJ as well, especially one that has a well developed tertiary Ti.
I thought I was an INTP for a long time, tried to live in a way that healthy INTPs live, and realized everything was going to hell.
Nope, I am an INFJ, after all. And it was quite a breathe of fresh air to realize this. The following wall-of-text would be a good case of Ni-Ti at work, with Fe shut down. If I was to say all this to you in person, you would not mistake me for a Ti-user; or, should I say, you would immediately see the strong Extraverted Feeling. It's hard to project Fe without other subjects (humans) in physical proximity. You can say, on some level, it is a.... 'show' function, it is a 'tool' to navigate through social space. It likes to turn on around other humans, and it likes to turn off when we are contemplating an idea.
-I love history! NOT dates or random facts, but rather the interconnectedness, the cause and effect relationships between events, and the interdisciplinary nature of it...such as the connectedness of Maslow's Hierarchy of Needs and the Universal Cultural Pattern as an explanation for the rise and development of civilization.
This is very interesting, and it gives off a heavy Introverted Intuition vibe (either Dominant or Auxiliary). However, Introverted Logic can also come to the same conclusion regarding the interconnected nature of these concepts.
One possible way of differentiating whether you came to this conclusion using Ni or Ti might be: do you 'see' the interconnectedness between these concepts as something hazy, singular, muddy, all-encompassing and hard to describe in explicitly articulable words (much more Ni-like), or do you 'see' the interconnectedness as hierarchical categories, where pieces fit against and alongside one another in a neat, tight, and coherent manner that is relatively easily to articulate in explicit terms?
Ni insights are difficult to articulate because it is, well, perhaps the most purely abstract cognitive function. I describe my psyche as lotus flower singularities blooming and collapsing. There's a strange aesthetic quality to it.
Ti constructions are not easier
per se, but they are expressible in explicit, tight, well-defined language in a logically consistent way. Ti insights are 'easier' to articulate insofar as they are based on understandable and well-defined terms. They are still difficult to articulate because it takes a really long time, it's logically exhaustive, and it gets difficult to keep track of where all the pieces go for non-Ti users (e.g. INFPs). There is another kind of aesthetic quality to it, the quality of congruence... of coherence. And this is where it can be confusing, for
both the INTP and INFJ will strive for internal coherence of thought.
I know an INTP in my graduate seminar. He and I have similar philosophical beliefs, but the way he filters through new and old data is staggeringly quick. Dominant Introverted Logic works incredibly fast compared to myself, because it is essentially the INTP's operating system. He can categorize, adjust, expand and collapse the framework as needed, on-the-fly.
I need to spend time in a high introverted mode (not necessarily alone, but deep in my own thoughts and cut off from the sensory world) in order to filter out the data in order to make
logical coherence of them.
That's not to say I don't understand the data in some way, because Intuition usually already grants me most of the 'understanding.' The issue is sometimes, there are what you might say 'muddy,' or 'congealed' pieces of data that have not been explicitly articulated regarding to 'where they stand' as abstract concepts.
In my case, I use Introverted Logic to help me parse out my intuitive abstractions, making them clearer and more explicit for myself. If I don't do this, it would be very difficult to convey Ni-insights to other people.
I think highly introverted INFJs can easily mistake for INTPs, especially if they mistakenly believe their Ti to be better than it actually is (which was my mistake). In reality it's not the Ti at work, but rather Ni which lets them see the truth or nature of abstract ideas, ideal meanings or essences, while Ti works at a way to construct a framework that gives it all a nice, subjective and internally consistent framework.
INTPs, I would describe as theoretical logicians and logical philosophers. Their logic is not forced, it is natural. It is how they are oriented towards the world, and how they make sense of things.
INFJs, I would describe as social scientists. We think just as abstractly and theoretically, perhaps moreso because Ni is a perceiving function (this is an interesting question, whether we think more abstractly--but this might depend on the definition of 'abstract'). We love pure logic, theory, and abstraction as much as the INTP due to the introverted nature of our Dominant and Tertiary functions. Initially, I believe pure abstractions are just as addicting for the INFJ as it is for the INFP. However, this gets a little boring, dry, and stale for the INFJ over time, if the INFJ does not have an external outlet insofar as how it affects human beings, human systems, and their understanding of those systems.
This is why, I think, the INFJ is much more of a social scientist. INFJs use their abstract theorizing to gain a greater insight and deeper understanding into the human condition. An INTP will be much more at home when abstracting theorizing
objective contents of thought, that is, contents that are
devoid of the human element, due to their Inferior Fe.
In terms of typical behavior/trairts, INTPs are typically a little 'nerdy' in the traditional sense (I'm not trying to be pejorative). They don't put as much care into their physical appearance. They are not necessarily socially awkward, but they don't have a very good sense of how to navigate through 'social space' with all of its unwritten rules and methods of playing this game. It's extremely unnatural for them, being the Inferior function after all. Most INTPs seem to be happy in ill-fitted jeans/shorts and a T-shirt. No problem, but not an attire I would feel comfortable in.
INFJs typically put much more thought into their appearance. It is my belief that INFJs are more in-tune with the aesthetic side of their decisions, and typically take care to represent themselves as well-groomed to the outside world (to other human beings). Things such as details of clothing, whether shoes, belts, and shirts/jackets match in color scheme, and these kinds of things. I wonder if this is caused by a combination of Fe-Se, but I haven't given this much thought yet. This is, however, something I've noticed in INFJs.