I'm hesitant to post this but...I actually "under idolize" idols a lot, mentally.
I tend to credit a lot of the idols look to having the best make up artist and stylist. We all know make up plays a large part in how someone looks and even clothes can make you look better/worst. I've seen idols in very "comfortable" clothes and idols without make up and while most aren't "ugly" and still very pretty, they definitely don't look god/goddess visual status all the time. I feel there are a lot of "regular" people who are pretty and I'm confident given the same stylist and make up artist, they will also look like the prettiest humans in the world.
I'm also aware of the effects of autotune and sound processing in the finished product of a song and I'm sure a lot of kpop idols don't sing as well as you think. Even when singing live, the voices can still be tuned.
Even with personality, given all the bullying cases or even example like Day6 Jae after leaving group, I'm pretty cynical with idols personality, you simply just don't know how they really are, even some of my faves I "catch" little signs of them getting out of character and potentially red flags.
I also don't get the whole idol are the hardest working praises. I'm sure the job is hard hard but so is just about every other job out there. Take for example, nurses, especially during the pandemic with only a fraction of the pay the top idols get.
But I never let this get in the way of enjoying kpop. I see the hobby as a fantasy, much like enjoying playing video game or watching a movie. I'll praise my faves like they're the prettiest, kindest, hardest working humans in the world, but it's all part of me partaking in the hobby itself but in reality, I'm very well aware and is conscience of all the issues you've mentioned but being realistic about it is no fun lol
So stan my faves because they're the prettiest, hardest working, most talented humans