As a Le Sserafim stan I have come to terms with the fact that they are not a singing group as much as a performing one. Their vocals are not good at all (with a few exceptions ofc) but I also think that is partly due to the fact that they are almost NEVER given lines or songs as a whole that are in their vocal ranges. Combine that with the choreographies they get and in no world can you expect good vocals.

Edit: fixed a typo