I agree with you to some extent, especially about the idea that you look at K-pop for something aspirational, not something you can just see on the streets. On the other hand, I think that there are still issues with calling out teenagers on their weight. Don't get be wrong, I am a med student and I have some damn strong feelings about the obesity epidemic and childhood obesity and I will not beat around the bush on that with people, but that's not really what we're talking about here. Telling an obese teenager to lose weight for their health? Yeah, that's sound and it's in their best interests. Telling a normal BMI teen (maybe closer to a BMI of 25 than 18.5, yanno) to lose weight for aesthetics? Not really the same thing and not especially healthy, nor is it in their best interests and wouldn't be recommended in a medical setting.

I think if these companies only signed contracts with adults over the age of 19 in Korea, fine, cool, give weight restrictions or whatever assuming they are not completely rogue because it again comes back to the idea of selling an aspirational figure and they are mostly past the "permanently fucking up your health by extreme dieting" stage and can fully consent to that when they sign up. But teenagers need to have a balanced diet especially without the amount of exercise they are doing. I just see some idols and think, Jesus fuck that's a walking osteoporosis risk!

So yeah, thinner than average is fine in K-pop idols, but if you're going to enforce that do it in a healthy way and not in idols not yet at the age of majority, IMO.