re:why sm debuts c-idols, rv lost to bp and twice saleswise at the start because they didnt have international pull like twice's jline or lisa's seafags. aespas sales are high because of cfans and sm knows 1 single c-idol will lead to cfans checking the group out and stanning other members like karina or winter.
cfans hate sm for mismanagement but still stan because sm scouts kids from singing shows like chenle, 2ning, xiaojun and has a rep for debuting skilled vocals so china has loyal smhags despite exo-m complaining about mistreatment. cfans are also low maintenance because they know ccp dislikes kpop, even sm doesnt do any chinese promos cfans will still support from afar, buy albums and stay loyal. sm is losing the japanese and intl market to hive/yg/jyp, china is the only place they dominate over other big 3 firms