My intuitive image of functional preference is a pool table.
It's never totally horizontal, so the experience-balls of life will always have a tendency: the ball will roll - hesitantly or quickly - towards the end of Sensing or Intuition, or - at the judging table - towards the end Feeling or Thinking.
Hm... maybe the corners are I vs. E and somehow cross connected so the ball drops down the hole of extroverted Intuition for instance and roll subconsciously / subtablishly towards introverted Sensing.
Memory? If the balls are stacking up at the end of preference the table would get more and more bias in that direction?
"Balance"? If the ball doesn't know what way to roll, the preferential process will take forever in each case and the number of balls you have time for processing will be smaller. Life is passing you by!
= Yay for strong preferences?