I had my mom read the SLE/IEI duality description a long time ago when I was having trouble figuring out her type, and she said she didn't identify with it at all but that it actually sounded quite a bit like me. I was just like "whatever mom, I'm LIE, and you don't know what you're talking about".
Anyways,
I don't think it talks enough about how the IEI helps the SLE deal with stress through use of Fe which the SLE finds so refreshing (a very important aspect of this duality) or how the IEI looks to the SLE for guidance in logistical/practical matters. I think IEI's also tend to get weighed down by focusing on obstacles and need assurance that their desires can indeed be reached. They can push forward, and the obstacles aren't really as arduous as they might seem. Offering knowledge about the systems in place and how to maneuver about them helps. The SLE knows how to use the rules, policies, and procedures of an institution to his/her advantage as well as which rules are actively enforced and which don't really matter. They can offer a plan for recourse against those who are bothering the IEI, especially if those people are breaking the rules. If the IEI is the one breaking the rules, then the SLE can point out where the problem lies and suggest an alternative course of action.
The SLE needs ethical advice from the IEI not simply to attain and remain in positions of power, but also simply to be effective in social situations and make good decisions in life. IEI's can explain why something is morally right or wrong without focusing on Fi aspect of it too much and rather
putting on a little Fe display which demonstrates how they personally feel about the behavior in question. The SLE's response may be something along the lines of, "
Okay, okay... if it matters to you that much then I will/won't do it." The IEI didn't guilt trip the SLE or make the SLE feel like a bad person. The focus wasn't on "the principle of it" or good vs. evil. The SLE goes along with the IEI not because it's "the right thing to do" but because he/she wants to make the IEI happy.
SLE's can make hasty decisions (partially to get it over and done with because they don't like uncertainty and partially because they minimize the significance of obstacles and feel comfortable simply plowing through them to reach their objectives), and IEI's can tell them that there's no need to be so rash. There are factors that still haven't played out yet, and it won't hurt to sit tight for a little bit and wait to act until the timing is better.