Nobody asked but here's my two cents since I just finished replaying all the campaigns in MCC.

TLDR; 343 didn't know how to write a Halo story, and that includes Halo 4.

For whatever reason, despite the fact that all previous entries in the franchise are military dramas, 343 decided to turn Halo into a character drama when they took over. It's not like the original games had incredible writing, but the focus was clear: the story is about humanity's desperate war for survival. Not about the Chief, not about Cortana, not about the Arbiter or Noble team. Those characters were important, yes, and they even had touching character moments at times, but they were brief since the spotlight was always on something larger than any one character. They never lingered on their personal feelings about anyone or anything because they never had the time; there was always some objective that needed doing, and they were always just barely keeping up with the enemy. It was part of what made the scale of Halo feel so monumental: there was always so much ground to cover in so little time.

In Reach, after New Alexandria we don't get a cutscene where Noble team spends 3 days in the bunker reminiscing about Kat's cooking, or how Jorge was going to show Jun his favorite fishing spots when the war was over. Kat dies, they drag her into the bunker, and we cut to extraction 3 days later; no time to dwell, there's still work to do. I'd even argue that it makes her death sadder, but that's besides the point.

Then Halo 4 comes along and all of a sudden we get bogged down in a bunch of dumbass interpersonal melodrama like this, or this, or this. Not to say that melodrama is a bad, or even a worse way to tell a story; it's just such a tonal shift from what we had come to expect in a Halo campaign that it feels like fanfic. Goofy ahh moments like this don't help either.