Sacred Haven of Debauchery

Nonsense, no set of silly questions can replace the analysis of words and actions by a competent psychologist or psychoanalyst.

Of course, a psychologist, sociologist, or psychoanalyst will give you a much more accurate assessment. In their assessment, they will not only tell you about your character but also give advice and guidance, tell you what you need to work on and what you need to adjust. If it's a sociologist, they will help you determine the role in society that you will be comfortable with, and much more. If it's a good psychologist, they will try to make you better. A test certainly doesn't provide this, but don't forget that the same psychologists are working on it. Although there is no personal contact, it is possible to create a more or less universal test, which, of course, will have significant inaccuracies (which simply need to be ignored), but it will still help you understand yourself (if there is such a need).

by reading about your personality type and admiring its positive aspects, completely forgetting about the bad ones.

And here you are absolutely right, but this is not a criticism of the quality of the test. The assessment devotes a lot of attention to the negative aspects, and this is what you need to pay the most attention to. After all, we already know about our good qualities, but few people highlight the shortcomings in the test.
And these tests also have an excellent feature: they often have an error specifically in the "good" part, that is, a person begins to attribute to himself qualities that he does not have, but in the end, by convincing himself that he possesses this quality, he artificially develops it in himself.