Why won't SM let Giselle rap or give her a solo rap like Jennie's DDU-DU DDU-DU rap?

the less rap in kpop songs the better

I don't think SM really cares about Giselle like that to give her an epic solo rap part. TBH I don't think Giselle's rapping is really that good or anything unique.

Plus, Aespa don't really do any big rapping in their songs, it's more talk rap that anybody could do.

Actually Giselle is a good vocalist too but so I am not bothered by the lack of rap parts. aespa line distribution is often fair.