I'm often skeptical about those things, because they try to measure, but those measure are based on a definition of vocabulary, which is difficult to define.

Personality is vague. It's pretty common knowledge that the brain is a complex machine and it's quite difficult to distillate some sort of evaluation, metric or measure for something that obviously has a million or billions ways to be measured.

It's already hard or difficult to treat psychiatric illness, so evaluating personality seems like an odd quest.