The one flaw I've noticed with this, is the fact that (well, at least for me) attraction and connection are intertwined.Guys, would you choose a very attractive person who you had a medium connection with or a pretty girl next door type (not stunning) girl who you have a deep connection with?
While I'm not actually a demi, I have found that whatever starting level of attraction I have to someone, it rises or falls depending on what I see in them. I have met girls that I thought were absolutely gorgeous, nigh a perfect fit to what I imagine I'd be with, but after knowing them, the attraction faded to a simple "yes, they are very pretty, but I'm really not attracted in that way".
This effect works in reverse. I've met girls that I thought were pretty, perhaps not the "prettiest" or however one might rate someone, but the more I learned about them, the more my vision of beauty conformed to their image, as long as the personal connection stayed.
Ironically, although I have an abnormal favoring of Fi over Fe, I know for fact that I favor Ti over Te.
In fact, in the subject of physical attraction (purely physical), my Ti and Si took over and analyzed every single person I've been attracted to, and pieced together a list of every single trait they all had in common.
I can't help but carry the mild curiosity though.. If I end up with a Fi user, will I still use Fi at all, or will I default to the natural order of functions. I know that sometimes what you really need is someone who carries what you really need, rather than an attempt at providing for yourself, if that makes any sense. I am fairly certain that every person I've considered for a relationship has been a Fi user, with the exception of perhaps a Ti user or two (TPs haha). I guess this is one of those things I cannot simply "figure out" without actually experiencing first hand.
I'm rambling, I'll shut up now... Just kidding, ENTPs never shut up.