Well, I think subtypes exist. I think the effect they have on you really is that it depends on what you prefer. If you have say an ESFp with Fi sub type then their Fi is to put it in basic terms, more noticable. If said ESFp has strong Se then there's very little Fi there. To me they can seem like an ESFp-ESTp hybrid.
So it can depend on what you want from a partner or a friend which I think can also depend on the place you are in life-what you want can change over time!
Rick De Long is probably a good example of an internet ENFp Ne. I've even heard other ENFp's say they admire his Ti.