I'm well aware of that, I'm just saying there is a pressure for looking pretty. That's true of any industry in which you go out to perform. Even writers have to have a certain look, and they're reclusive half the time. But just look at someone like Neil Gaiman or J.K Rowling, people know their image. It helps them sell books.
As I said, we all think about beauty. But the standards, even in k-pop, don't have to be that high. Yes, they're specifically called "idols," but really... aren't all musicians idols to somebody? This is just taking a phenomena and giving it a label to justify certain actions with, including setting harsh beauty standards. But again, we all think about beauty. We all look up to musicians. The standards still don't have to be that high for us to go, "Oh my gosh, I want to be like that person!" Their skill in performance also does that a lot. It's still music.
I'm always hearing people gush whenever an idol "eats the CD" during a performance or about "how stable they are" and "how great their vocal color is." People will regularly talk about how "Yuqi's voice is so awesome" when referring to G-Idle... On and on and on. Whenever an idol self-produces (not saying they have to) it also gets tons of attention. Again, Soyeon of G-Idle got a whole video (might have been a series, bad memory on this) going behind-the-scenes on that...
Point is, yes, k-pop places a ton of pressure on looking pretty. But it seems like even a lot of fans don't care that much as we might think...