Well, the preference for effort is what's important in this context. An INTP generally prefers to spend more time understanding something than making a decision. Long periods of Intuition interrupted by short periods of Thinking. The opposite for INTJ.
So this is for surface evaluation. Gotcha.
I guess one of my biggest complaints with MBTI, and how it's set up, is that perceiving functions (Ni, Ne, Si, Se) and judging functions (Ti, Te, Fi, Fe) are used alongside terms like 'judgers' (Ni, Si, Te, Fe) and 'perceivers' (Ne, Se, Ti, Fi).
Which doesn't seem to make much sense, because it makes people think that IJs are more like 'perceivers' and IPs are more like 'judgers,' when this is not the case.
I guess what could be done is establishing introverted functions as 'frameworks,' Ti and Fi (how things are) being 'perceiver's' frameworks and Ni and Si (what you see) being 'judger's' frameworks, and the fact that one has 'judging' functions and one has 'perceiving' functions does not make one more of a 'judger' or 'perceiver.' So then the difference between an introvert and an extrovert would be whether the framework is on top or not.
...If that made any sense whatsoever.