I don't understand Rick's argument. He's saying an extratims will use their introverted functions "carelessly" or "for fun" while introtims will use their introverted functions with "a sense of seriousness and greater concern and carefulness about what he is saying and doing".

But the example suggest more of a J vs P dichotomy:

"Compare, for instance, the playful theorizing of ILEs and SLEs with the weighty thoughts of LIIs and LSIs. Or the haphazard and situational emotionality of SEIs and IEIs with the deliberate and focused emotions of ESEs and EIEs. The situational technical solutions of SLIs and ILIs and the productivity and efficiency-based life philosophy of LIEs and LSEs. Or the playful and changeable friendliness of SEEs and IEEs with the long-term alliances and moral awareness of ESIs and EIIs."

Moreover, in the introtims we have "weighty thoughts" and "long-term alliances", but then we have "haphazard and situational emotionality" and "situational technical solutions". The introtims-acting-with-a-sense-of-seriousness backflips.

And why, to illustrate his case, does he use extroverted functions? (Fe for SEI/IEI vs ESE/EIE and Te for SLI/ILI vs LIE/LSE)