Fair point. It's a huge field and I have no defensible option there. I was thinking of the wireless Anker IEM and the various older ones that accompanied my phones, even though as mentioned in the other comment I'm aware of higher class (and sometimes even cheap) IEMs that do exist. But still, I wouldn't generalize it like that, I really do like the KSC 75 a lot and think those kind of headphones are too often overlooked despite their quality, which collides with classifying them so low.