You are free to think the way you do. But from someone who isn't obsessed with neither and doesn't understand it as much: what you say makes no sense. Looking at it from a child's point of view, it doesn't seem to describe people accurately.
I'm not saying your 18 months of research is worthless but I am saying it's not complete - our understanding of the human mind will probably never be complete. 18 months is not a long time in terms of researching something as complex as the human mind. I would say 18 years is not even enough time. You are basing what you believe on things you read, how long have you spent actually studying people - their beliefs, their experiences and how it relates to their actions?
I'm not trying to attack your beliefs, I'm just saying, from a more niave and objective standpoint, what you say still makes no sense to me - it lacks scientific backing. It's not that scientific backing is all there is, but MBTI found four personality traits that I can see in everyday life. I can't see how functions represents the behaviours I see in everyday life. It may say how people are suppose to think but it doesn't help me see how they behave. I think there is more to the human mind than mbti says (let alone functions), people just can't be broken down as easily. Life/past/present experiences, trauma, and social encounters all affect how one would react/think in life. I do not believe that functions or mbti can explain the cognitive behaviour of our minds that easily.