if you love BTS because they’re attractive, they sing and dance well and they have cool videos, then yeah, you should probably check out other idol groups. but if you love BTS because they tackle stuff like mental health and class struggle, well... idol music may not be for you
like, there are arguably a few exceptions aside from BTS, but for the most part, idol music is full of poppy love songs. you’re not gonna get a lot of lyrical content deriving from that
most of us love BTS for a multitude of reasons, some including stuff other idol artists can offer. but it’s basically impossible to find any others with the full combination that BTS can offer.