"we want more adults in kpop!! we want age appropriate concepts!!" and you're ignoring choi yoojung (26 years old) who has written and composed for her own cb songs.
I think it's beautiful that all knights has arashi chan in a pedestal but still decide to ragebait her before showing their true feelings, although this doesn't apply to tsukasa bc he directly goes narukami senpai is so awesome.