My honest opinion regarding QWER's new songs

This is something I've always wanted to say, but I wonder if it would be better if only Siyeon, the main vocalist, sang all of QWER's songs.
Personally, I feel like when the other members' parts come in midway through, it breaks the mood or the flow of the song.
That's why, for me personally, I've always preferred the songs where Siyeon sings the whole thing.
In actual concert venues, since the members are busy playing instruments, it's practically impossible for them to sing, so they're likely in a situation where they have to lip-sync; I think it would be better if the vocalist just sings everything alone, and then occasionally, during fan concerts or similar events, the members could add surprise choruses or take on specific parts.
In particular, because Chodan's and Hina's voices have such distinct personalities, it tends to break the flow.
Or perhaps they could release two different versions...
Am I the only one who thinks this way?