Even if KPop had better lyrics, they would be in K-O-R-E-A-N and would not be intelligible to the i-fans.
The most important part for a KPop act's song is the performance. After that everything comes second.
So, the lyrics , if they are actually sung, have to be 'flowing' easily . Their meanings are quite less important, since not too many i-fans would care anyways.
As of now, Korea's greatest lyricist, who won the Lyricist of the Year award from Gaon for 2 consecutive years, is just 29 years old, born in 1993.
She did not attend a University.
Still she managed to write lyrics which were good enough to win the Lyricist Award for 2 consecutive years.
The caveat is, she wrote the lyrics for H-E-R-S-E-L-F, and no KPop act is eager to ask her to write lyrics for their title song.
Why?
She is unable to write good lyrics for the acts who are catering to i-fans since she is trained to write lyrics only in K-O-R-E-A-N and never learned to empathize for the i-fans because she was never taught how to write lyrics for the KPop acts.
As a result, the best lyricist in Korea is not a full time lyricist. She is engaged in a bunch of things, which I do not feel like recounting again today, but it is enough to say that writing lyrics is not the biggest thing she is known for.
If someone who spends a lot more time doing something else is Korea's best lyricist, and she not being able to write any lyrics for a true KPop hit (other than one song for herself), no wonder KPop lyrics are quite forgettable. (Her own lyrics lose a lot of meaning when translated into other languages which is why she is not that popular outside of K-O-R_E_A.)