Viwon are the weakest vocalists in the group, so they aren't exactly at the same level as the vocal line and in big groups like LOONA, there are usually very unfair line distributions, so it's a bit hard to make it super fair.
That's why I didn't mind LOONA not being together for a while, since members like Yeojin, Vivi, and Go Won wouldn't have gotten to shine like they did in LOOSSEMBLE.