Jyp needs to give Nmixx tracks similar to what NiziU and Twice are getting

The whole noisy experiment isn't working for them. Itzy fits that style better. Give them a TT or Chopstick style of song for their next cb.

maybe they like the music they're making and want to be different?

Then what's the point of Nmixx? If they have the same music as either or both then you have 2 or 3 groups of the same kind which is pointless.

they can definitely pull it off better since they have better singers

They have different teams. And apparently very competitive teams who do not share work. So unfortunately we're probably looking at the best NMixx's team can do.