Usually the point of being "J" is being closure-oriented.
Being closure-oriented means that completing the task and/or having a functional solution is the priority.
Thus, at least from an NTP perspective, to reach closure we see J's reaching premature conclusions on things that cannot actually be concluded yet, for whatever reason. NTPs are more interested in the nuance; in that respect -- the details of the conceptual -- we are more fastidious. I suppose if you're wielding Te, you can be very fastidious in the external details... but you'll lop off the conceptual aspect in the process of achieving your goal.
THAT's what I meant. Your talk of "fastidious" isn't really in the same area I was discussing, I don't care that much about the external details except as far as they impact the rigor of the conceptual framework and then they become important.