Lots of good theories here, but none saying "TikTok", which I think is the answer.
TikTok is a big reason wired headphones are popular. AirPod microphone quality is spotty and improving the quality is non-deterministic. With wired earpods, people put the mic next to their mouth and get above-average audio quality.
Like the article says, wired headphones have also become a fashion statement akin to vinyl culture.