role function in socionics explained
both intjs and entps are after the meaning but entp wants the meaning right now, right here. and this is basically the main difference between ne and ni.
ni is ok with doing meaningless, mundane and boring shit in the moment "if" that's what it takes to reach the big ni prize in the future. (for example studying hard for exams, memorizing boring ass dates and names and latin terms)
then it makes sense for ni doms to be si role, doesn't it? they got that patience for doing mundane shit. they will wake up early, they won't stay all night up, they will eat at the right time, they will follow a pretty good schedule as a result.
an isfj or istj can actually enjoy working in their little garden and growing tomatoes or maintaining their aquarium every day. these things would be "purely" si things to do.
ni doms won't do those things at all. they can't care less about repeating some sensory things so they can feel "relaxed" or whatever. they will relax if they are working for actually se useful things. what a HUGE waste of time! just go buy some tomatoes from the closest place and use that time more wisely, sheesh.
THEN, you can also understand how entps are se role. they will do se things while exploring possibilities but they won't just spend shit ton of se energy for purely se reasons. for example they won't be into sports because there are no possibilities to explore there. all soccer moves are already invented. all fighting styles are already explored. 2k years of human history. you can only be a disciple of certain techniques and master them by repetition which is not something ne motivating.
but entp is inventing something like adam savage? then, suddenly, se role of entp manifests. build something experimental spending a lot of se effort and test it and see if it works like you thougt it would or not OH YEAH! that's the juicy stuff for ne.