My stance is that type is not in any way a static set of functions. As you put it, there is no such thing as INFJ(tm). That's what's called the
Forer Effect. People assume that these labels are absolutes and bend their self perception (and their perception of others) to match these stereotypes. This usually happens when enough of a description matches up to convince the individual that the rest of the description must be true. We've seen this with Majesty's insistence than she is an ENTP, and therefore the ENTP pattern is how her mind works, which of course means that every other type model is perfectly accurate and inclusive.
My stance however, is that personality type is at best a general assessment. INFJ is not always Ni, then Fe, then Ti, then Se, and no two INFJs are perfectly alike in their development. Some INFJs have stronger Ni than others. That's just obvious. Some of them have stronger Fe than other INFJs. Also obvious. The same is true with all the other functions. To take it a step further, it's also obvious that some INFJs tend to use their Ni and Fe in certain ways while other INFJs tend to use those functions in different ways. For example, some INFJs tend to use their Fe to accommodate other people, while other INFJs tend to use their Fe to establish how they feel things should be.
There are a lot of variations in the human mind and personality, and
at best the personality type model can somewhat describe us the majority of the time. The instant variables start to get thrown into the equation of the operation of the mind, its perceptions, and its reactions... the basic model begins to bend and adapt. Otherwise, stress would automatically cause people to be entirely ineffective or capable of overcoming the unexpected.
The cognitive functions are quantifiable. I don't have a system for doing so, and simply used the analogy of the IQ scale to make the point that some people have better developed functions than others, within the members of their own type, as well as without.
1. Most people exhibit a pattern that appears to coincide with the type models. For example, someone who is an INFJ will likely have perspectives that resemble Ni, Fe, Ti, and Se in varying measure. However, this doesn't mean that all of the people who are best fit by this type use those cognitive functions in the same way, or as well.
2. I believe that what we are calling the cognitive functions are actually "states of perspective" in the thought process. These states become more and more expansive as we use them, grow, and develop as people.
3. I think that these basic states of cognition eventually expand into one another as they grow. For example, as the perspective we would refer to as Ni develops in an INFJ personality, it will begin to perform in ways that also resemble Ne. As the INFJ personality develops Fe into what resembles Fi, Ti into Te, Se into Si, all of these functions begin to reinforce one another until eventually, and ideally the base personality type is very difficult to distinguish because all of the cognitive perspectives have integrated.
4. I believe that the mind adapts to any given stress by switching perspectives, or cognitive function preferences, temporarily. This is one of the best methods the mind has for developing the lesser functions.
5. Because the mind is adaptive, the
only proof of personality type is the over time preferences. The cognitive functions we use most and prefer to use most, especially when not experiencing stress, are the natural or reflexive functions. These determine type, but type does not dictate anything to the individual outside of Forer Effect.
So, yes, I am very far from believing that the mind can be simply divided into 8 neat little parts which are then ordered sequentially. This assumption comes from misinterpreting what the model is attempting to represent - which is the most common state of operation. Without understanding this, there can be no true understanding of type because type happens in motion. Any snapshot of the individual parts is very short sighted because the mind is always in motion, and it is understanding the mind in motion that is the true understanding of type.