Can you please discuss the reliability and validity of personality test?

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See the attached file.
With the "necessity" question I gave possible answers for both sides.
I did not use Anastasi and Urbina (1997), but I found another book on the same topic by Urbina.

Please discuss the reliability and validity of personality test and what role (s) does factor analysis play in constructing personality tests? In your personal opinion are these test necessary? I tend to believe these test are necessary.
Which estimates of reliability are the most applicable to these tests? What is the relationship of convergent and discriminant validity to these tests? Finally, can you discuss whether personality test results can be projected to potential or continued employee success: To what extent can these tests determine how well an employee will function in his or her assigned role?

Validity is based on the collective and cumulative test scores over time. Inference is not so much dealing with the test, but the honesty of those who are interpreting it. Of course, consistent parallels with the existing literature and scores elsewhere are also significant. It is all a matter of judgment. Regardless of how scientific and quantitative the score, interpretation is never quantitative, which is the problem inherent in all quantitative studies.

Reliability is a different matter. The concept of the "true score" is a contested one. Definitions differ, but the one thing they all have in common is the ability to quantify a qualitative variable such that the former completely exhausts the latter. This is not possible because quantification is an artificial device that makes research easier. Numbers are not as ambiguous as ethical concepts in context. Reliability is really about the scores. Total reliability is also not possible, since the variables that might explain variance over time from the same sample are almost infinite. Again, yet one more subjective element that removes the "science" from "social science."

Factor analysis is problematic. It is essentially trying to make sense out of the massive ...