What are people’s opinions on socionics?

Well, I didn't say that everyone should be chosen based solely on tests;). And these aren't exactly horoscopes. Horoscopes aren't scientific. But this is science;).
And it doesn't mean that you shouldn't be friends with other psychological types. Quite the contrary, it indicates how, considering a person's psychological characteristics, you can understand them and become friends with them;). Or at least accept them as they are, since a psychological type is formed in childhood and then hardly changes.