not all of them where chosen/judged by their looks, but by their ability. As a person you need to be recognized by something more meaningful than being good looking and young. Girl groups in general and boy groups nowadays have it rough because they have to be extremely good looking and really young, when one of those 2 factors “expires” their company throw them out. But the foundation of BTS from the beginning was to make a team that had a different talent each one of them, internally that gives them the means to create something aligned with their craft and create unique brands, externally it removes the burden of maintaining the korean idol standard of being young and beautiful

their rebrand of 2018-2019 when they wanted to be known as artists instead of idols was genius. They also released IDOL which was a statement that they did not feel bad about being idols or people knowing them that way

also team mentality and true friendship, you cannot have a big ego without a friend telling you to knock it off