Those things work no better than tea leaf readings. I’ve been on both sides of this issue, as employee, and as employer.
If you want a group of homogenized people all into the exact same things, you can perhaps tailor the test to accomplish that. But outside that, they accomplish very little, and can be quite destructive… preventing you from hiring key people.
The tests do not take nuance into account, and when two differently worded but similar questions are asked, a bright personality can be interpreted as “a liar” by the test.
The tests are also heavily skewed to benefit people with “champion” personalities… which result in a staff top-heavy with one single personality type, which is actually not very healthy for a business, nor does it mean the staff is truly full of champions.
I’d place no more faith in professional personality tests, than in the silly ones you see in Parade and other so-called women’s magazines.