because they were never know for their vocals
that's why even if Yoona is much more popular in the public, Taeyeon always beat her when it comes to musical project ever since their debut, because in contrary of Yoona, taeyeon was always praised for her voice
MSG wannabe says hi (for example), some of them is even a comedian and surely never considered as a singer and they beat SM girls on charts sometimes (they might even take down Taeyon's invu on charts soon), that's what you call the real public recognition and not just fans statement. In the past I was also kinda fell to the media play of how yoona "popular among public" but after she went solo, released some singles and even mini album and all flopped, its becomes clear.
What's with the revisionism, Suzy got all-kills when she released her solos, even her osts (which she has a lot since debut) charted very well, and despite not releasing many music since she left jype, she's always gaining attention when she sings. A lot of your faves would love to flop having all-kills lol
If I am correct, the only songs she got allkill were dream (u must count baekhyun's presence too, he has tons of avid fans) and pretend (pretend dropped fast on charts). After that? She just released a song some days ago and it's nowhere to be seen on melon top 100 for example. But to be fair with you, if we compare these two (since these two are the ones mentioned on this thread), suzy is indeed more wellknown public than yoona I can give you that (I take this conclusion based on performance on both fields acting and solo singing), social media engagement like instagram etc. But still, I don't think her public recognition is as big as how her fans made it to be. Again, to give an easy example, if you are that wellknown public, your songs will simply chart high, no matter even if you are a dang comedian like MSG wannabe (they are currently ranked high on charts and probably would take over Taeyon soon)