The world is far more interconnected today than it was even a short time ago (at least in the developed countries). We are literally exposed to so much more information. This changes the way our brains develop especially considering that most of our baseline neurocognitive functions need to be used continuously to prevent them stagnating and eventually falling into disrepair. Most of the time a person spends their life in habits and these become what they specialize in. It can become hard to break to break from these patterns if it becomes necessary to do so. This tendency tends to become stronger over time as we focus on our strengths and not our weaknesses. Of course formation of new neurons tends to decrease over time as well.
Some component is likely due to some "inherent" factor like genes, nutrition during pregnancy, etc. Part of it is environmental like exposure to smog, etc. Some of it is likely due to the networks that we are a part of. I guess this is because I think of "Intuition" as the level of interconnectedness in a brain and "Thinking" as development in certain regions, "Feeling" also seems to be region specific, Introversion vs Extraversion seems to be a measure of the level of causal loops or "how much the brain talks to itself"/reflectivity, etc. S seems to be more of a motor function/nervous system type thing? Es seem to be approximating functions very rapidly, but there is a tradeoff in terms of accuracy. F seems to be a level of sensitivity, but more than that... though it is hard for me to stay in a state of integration of all of these processes simultaneously as they seem to be broken by the random factors that life brings our way. I think these developmental capacities are not necessarily mutually exclusive I think over time networks may form where due to genetic drift or natural barriers a type of inherent factor may become isolated, but so may an environmental one due to culture, the networks prevalent there, etc. So someone raised in a hard culture may not have reached their full potential and life is much easier today