So I was reading a post someone posted and they mentioned Wendy and it made me think that despite Wendy being universally recognized for her vocals, coming from a big company and people being aware of her accident and things she went through, her solo flopped with the public. She's not a standard visual but she has a cute-ish face, and she's nice.
Maybe Wendy just lacks something that makes her stand out. Besides the solo thing, she's like the 2nd least popular after Yeri. She just seems like a regular, nice cute bubbly girl with good vocals. But people need more than just a voice to get really excited like they would for Taeyeon. I think even if SM gives her an amazing song, the interest will only last until the song, like Love Scenario with iKon. But it won't linger.