I think I will ignore this whole thread and just say what I notice as differences between them.
SEIs have a slower pace to their lives. They are more relaxed, while ESIs seem busier, though they aren't frantic or anything, but they seem to keep chugging along at things more.
They both can be artistic - I know artistic SEIs and artistic ESIs.
The ESIs I know have strong feelings about honor and respect and telling the truth and that kind of thing. They also hold onto relationships longer than they should sometimes, out of a sense of commitment and responsibility. I haven't noticed that to that degree at all with SEIs. I also think ESIs value being strong and capable in a way that SEIs don't - like it isn't as important to SEIs, not that they can't be strong and capable. And for that matter not that ESIs can't fall short of that. I guess it just seems like ESIs strive toward that more.
Either one can be gentle, and either one can have a bad temper. I know both ESIs and SEIs with each trait.
A lot of SEIs I know are into gardening. I don't know why that is. Also, fishing, and carpentry. Maybe it's just the SEIs I know. I don't know any ESIs who are really into those things, but maybe it's just the ESIs I know. Anyway, it's a trend I've noticed, whether it's coincidence or not. I guess I think something that SEIs and SLIs have in common is that they like to have physical projects and hobbies. Although, on the other hand, as I said before I know a few very artistic ESIs, and that is also a physical hobby. Maybe not in the same way, though? I don't know. There seems to be a difference in what they do for fun, but I can't put my finger on how to explain it.
Oh, and IMO (and this is most likely just the perspective of a supervisory relationship) ESIs are more argumentative and bull-headed.
I bet my LIE mom would disagree 100%
I don't want to get into this argument, btw, so disagree with me if you will but keep me out of it.