343i hates mix-and-match confirmed.
Seems like a big step back. We could mix and match various armor pieces in Halo 3, Reach, and Halo 4, but now we have to pick the whole set like in the MCC. The whole "each suit and helmet is designed with a specific visual style in mind" comment suggests that by allowing mix-and-match it would somehow run contrary to what the artist had in mind, and that the artist's vision is now more important than player choice. Y'know, the little things matter, too, and I can say that this will definitely be a strike against Halo 5. Reducing the number of options is always a bad thing.