To be fair, i misremembered your original statement. But,
Is an overstatement regardless.
And to use your own argument against you;
That line of statements is so entirely subjective for rookies who have not gone mainstream in the slightest. Which none of those 3 have.
You might not like the comparison to the other groups/idols like RV/ Winner / PJY etc, but they're valid. They just ruin the bar you wish to set. Or re-write.
Stanning has meaning out side the hardcore / stalker definition, particularly in a community like k-pop where there so many levels of fandom. The connotation here being that you're living in a world where (or that statement was made from one where) you assume everyone thinks the same about the group you like and holds them at the same standard. Another word could suffice, but stanning works. Suggest another. Fanning?
Sort of agree sort of don't with regards to RV. Their debut certainly wasn't as promoted or hyped over such a long period as you would normally expect out of SM. Which lead to some of the anticipation just not being there. And whilst I expect they were meant to debut this year, I think SM skipped a promotion cycle or two with them to try and take away /cover up some of the scandals they've had this year. But it was still there in droves. It's SM.
It doesn't really sound like you're willing to change your stance on it, and that's fine. It's all fandom stuff and people are entitled to hold their own opinion. Just means people are allowed to hold counter opinions as well.
I certainly didn't mean for it to devolve into this long of a series of posts, and I certainly don't "dislike" mamamoo as much as this has made it seem. If nothing else their name is fun to type. I just found the over hype funny.