Uh, I think you completely missed my point.
My point was that there ARE lots of worthwhile ideas that are not quantifiable or empirically verifiable. I think we probably agree.
Uhh dude, do me a favor and compare the Big 5 factors to the MBTI scales; they're all virtually the same concepts except MBTI lacks neuroticism.
The other four line up almost exactly with MBTI's E/I, N/S, T/F and P/J scales...they're so conceptually similar it's hilarious.
The only difference is that the Big 5 people came up with a better testing system. The ideas are all the same shit across all forms of psychological typology.
(P.S., the Big 5 also fails utterly if you're not able or willing to self-report honestly. It suffers precisely the same problem.)
Yeah the only difference with the big five is that part of their definition includes the fact that the scales are spectrums. MBTI's (as in the system designed by Myers and Briggs, not the version I use) big failure is the binary opposition aspect that any sane person would reject anyway...