Right. But that would be different answers so different results. That and plus the percentage it gives could give an indicator of perhaps not all the time (low percentage) or most of the time (high percentage). But evenso, that's not a flaw in the test, but the indecisiveness of man.
Oh you're definitely right. :yes
You're also right with your earlier statement that a change towards a closer walk with God may turn a T into an F (just like other life choice may at some point have an impact on your personality). And as for my change from I to E, well I can be extreme in either direction, but my average over time is probably just in the middle between both. So depending on the mood of the day I can turn out either. That's an expectable result, but a weakness of a typology type personality model, as I explained in that long post a few days ago.
Another reason why my results may have changed is that as far as I remember the last time I did the test and turned out INTP I did the test in German. This time it was English and while we can assume the whole thing is translated well doing tests in different languages can have different results in the same person, even though it shouldn't but it's a possible source of error.
Anyway.
There are various scientific reviews stating the test has a bad reliability, it's 4 scales aren't independent of each other, and if you run a factor analysis of the test it'll turn out with 6 instead of 4 factors. That's maybe why this test, although seemingly popular among many people, is not relevant in science.
Another point beside reliablity is validity. I'll try to make it short and without math this time, okay? :D
While reliability is an indicator for how precise a test is, validity is an indicator of whether a test measures the variables it claims to measure. That means how well the test or its underlying concepts match and correspond with reality. Personality traits are per definition stable over time. They are "accumulated/ average behaviour" just like climate is accumulated or average weather. So if "the indecisiveness of man" can change the results of a person every time the test is taken then one could worry if it's really a test for personality traits, or rather a test of situational mood.
So a low reliability is a sign for and a cause of a low validity, especially when considering a variable that is thought to be stable over time an over situations.
And someone here said their employer had them take the test. The employer probably didn't do that for giggles, but because they wanted to predict the employees behaviour or figure out what kind of work and working conditions would be best for that person. Now imagine they are making relevant and potentially costly decisions that can have great impact on a persons career based on a test that is not very exact, nor does it match reality very well.
Well the test is still fun and probably still tells us something about ourselves, but if a personality test is to be used in any serious context or for decision making then this test just isn't good enough.