Here's something for you to think about: you're supposedly an ENTP, more rational and able with systems than me, the irrational ENFJ. Yet, you completely fall on your face with regards to logic, philosophy and epistemology.
Either people are:
A) by definition, a certain type by self report
B) some other "true" type (that cant be scientifically measured)
People's self reports can change or be "wrong" by comparison to other points in time. This is fine. However, you threaten your credibility by then claiming that there is a "type essence" that you have access to with scientific precision. This is impossible minus MAGIC. Without it being a sort of measurement, how can you ever say your measurement is better than anyone else's minus having a judge decide? BTW, there is no MBTI judge! By what measurable mechanism would you access this true "measurement" of anything but your own type? This "type essence" wouldnt be something you can repeatably use a ruler against, because peoples own thoughts are THEIR OWN THOUGHTS..
Thank you for your cooperation.