Because they never repeat the same type of song
It's normal for casual listeners to have their own expectations based on their preferred Red Velvet songs. Everyone does. I've been stanning Red Velvet since right before Power Up era, and every single comeback is always accompanied by a group of people who "had hoped for something different like *insert name of a previous Red Velvet title track*". Truth is, if that's your premise going into every new Red Velvet comeback, I'm sorry to tell you but you will never be satisfied with a new release. I know this because I experienced it as well, when I was new to stanning Red Velvet: I had loved Power Up when it was released and was hoping for something explosive and electro-pop-like for their fall comeback that year, but I got RBB, which is far from what I expected. The whiplash was quite intense, and even though I did like RBB (and still do, it's such a classic), I felt unsure about my decision to stan a group that couldn't give me a safe ground when it comes to title track consistency, and instead gives me constant wondering if the next cb would be what I want it to be.
With time, I learned that every single RV comeback is never what I expect, but it's always to my liking. Of course, that is my opinion and not everyone who loved Feel My Rhythm liked Birthday, or not all Psycho stans were there for Queendom.
Which is why it's interesting to see kpop stans say the same things over and over again everytime RV comes back. Are you new to kpop and to Red Velvet? Is it your first comeback as a Reveluv? Did you decide to stan Red Velvet because Red Flavor was a bop and you wanted every title track since 2017 to be the same song over and over again? Then I don't think you are stanning the right group.
With Red Velvet it will be difficult for you to like every single comeback. But one thing is guaranteed: it will never be the same. Because Red Velvet is a group that is super consistent... in being inconsistent. And that's their biggest charm.
ReveluvTaglist reveluvs, what comebacks were you NOT here for? For me it was Wildside.