Isn't that a good thing? To me, Socionics was always a part of MBTI. (Though I only got into MBTI/Typology in 2016). I remember someone asked a question on Quora, "What does an INFP look like?" I answered like "Blank, expressionless face. Look innocent, harmless. Teddybear look. ISFPs look more intense, almost evil looking eyes." This was obviously regarding EIIs and ESIs. I don't think I even knew this came from Socionics at the time. Type Tips (an MBTI YouTuber) would often talk of Socionics. He would compare the look of Jennifer Lopez (ESFJ) and Tyra Banks (ENFJ) and say that Tyra has a more 'darker' look/vibe. He would say that INFJs and INFPs both have equally strong Ni and Fi, but INFJs prefer to use Ni and INFPs prefer to use Fi. I didn't know this was from Socionics at the time either. I had no idea where it came from. So, to my perspective, Socionics was always a part of MBTI.