The kpop system gives idols an expiry date.
Companies including hybe let's be real here push new acts and market them towards older acts fans .
They also give older acts less things to do so that fans naturally wanna transfer to acts making content.
In that sense , BTS is an exception , first of all, they are really passionate about music and will never stop making it.
Also, most armys only really care abt BTS and majority don't come from the kpop world so they weren't in on the kpop parameters. So yeah i agree that bts and armys are defying that ugly mentality.