I found it interesting that Level 4 is sometimes referred to as the "modern" level. In "modern marriage" therapy, you work on "differentiation" which is basically what is described as "self-authoring" level in relationships in Part 2 of the Medium article linked above.
Operating from Self Authorship means defining what we want and clearly communicating those wants to the people we care about.
Since I was engaged in self-aware therapy at the time, I can time stamp my transition from Level 3 to Level 4 in the realm of intimate relationships as right around age 40. "Passionate Marriage" by Schnarch is sort of the bible on this process. You know you've made this transition when you can freely choose how to respond (as opposed to react) in intimate relationships as well as less personal situations (such as performance review at work, where mature reaction is more conventionally expected.) Not that you won't react, but rather that you will not be able to un-learn the knowledge that reactions come from within you, not from others, and are not subject to deliberation or approval by jury of peers or authority.
Interesting note would be that due to the power struggle at issue in this therapy group, there was initially a very rigid, incensed white shirt/ black shirt division between spouses who wanted more sex and spouses who wanted less sex. Then as individuals "did the work" that took them from Level 3 to Level 4, these barriers broke down, because it could clearly be seen that what initially seemed like polar opposite functioning was actually just two-sides of same dysfunctional coin. Some individuals in the group remained stuck at Level 3, never able to make the transition.
Anyways, I agree with Jacob's theoretical rankings of well-known Republicans since, although somewhat loathe to admit, it corresponds very well with my level of sexual interest in these gentlemen
