I did watch the videos. The results didn’t match my “personality,” and they didn’t not match. It was just kind of a random hit or miss, as was the matching/not matching of the other options to my personality… which is what you’d expect.
I think JLeslie hit the nail on the head with what’s conceptually wrong with those quizzes in particular, the way they try to line personality up with physical characteristics.
Further, there already is an easy, evolution-based way to determine someone’s at-the-moment disposition: their facial expressions and body language, their tone of voice and word choice, etc. You shouldn’t assume very much about a person based off one interaction, since we’re all a whole lot more than one interaction, “we’re all a constellation” or whatever the phrase is… but you can get the information you need for the moment.
Even personality tests like the Myers-Briggs, which wider audiences have believed to have some measure of credibility—at least in that the MBTI has been used in professional applications—have been shown to be not worth very much. (Here’s a quick, stylized video explaining why).
The video also mentions the “Forer Effect,” which is one of the reasons these personality tests can seem compelling, and probably worth your time to look up. According to Wikipedia the effect actually has a couple of different names, but I find Forer’s Experiment in particular to be an effective example.
Notice how many of the descriptions were actually fairly vague. Someone’s “creative” or “pragmatic” or “gets offended easily” or “want to be recognized” or “hates losing” or has a “quick temper but cools down quickly” or is “nurturing” or “emotional” or uses “common sense” or holds onto “traditional values,” or is a “strong person” who “solves problems on their own” or is “confident” or “compassionate” … none of these descriptions are particularly idiosyncratic. That is, none of these descriptions are particularly unique. We may not all feel or display these qualities in equal measure, but very few of us would say we have none of these, even if we don’t match up with any of the physical traits these quizzes happened to pair them with.