To drag this old thread up, I disagree with the fact that somehow the strength of the funtion (which then often still gets tested through cognitive testing which are not exactly reliable) has something to do with the order of the function.
I mean, if you look at my results, my Ni and Fe are second to my Ne and Fi. That however doesn't mean that I indulge in Fe to find relief, far from it.
I'd say that every function has its part to play in your personality, and within that role it can be stronger or harder to use, depending on what circumstances you encountered in your past.
I've found the function order to be illuminating when it comes to deciding on my type, becoz I was confused before as to which was stronger. Due to the fact that so many of my functions test equally strong, I was conflicted. Asking myself however which function bails me out of a jam successfully *every time* was easy. And showed me to be Ne-dom. Just as asking myself how I reach out to people and love them was easy, revealing Fi as my parent. It also explains my reasonably limited but still good control over Fe while having such issues with it, as well as why Ti-users just make me feel stupid. And why I do not have the same issue with Ni as I do with Fe. Lastly, it revealed to me that although I thoroughly enjoy Se, I really oughtto watch it, as I have absolutely NO control over it.