I've been trying to figure out the purpose of each functional orientation.
Like Ji seems to help define your identity and know what is truly important to you.
Pe seems to help explore new avenues and learn and act as you go without prior experience
Je is proactive and helps get control of situations to get the desired goal/outcome and implement frameworks in objective terms.
I have a harder time understanding Pi, but it seems to be something you can anchor yourself to, experience/insights that is very reliable, something you can trust. I wish I could write more about what each of them means.