343i seems to have a pretty large bias against Sangheili when it comes to the Halo Universe in general.
First it showed when they made Sangheili unplayable in Halo 4, but it goes deeper than that.
The way they have been depicting Sangheili, be it in game, during cutscenes, or even in the live action material, has them as big, slow, and relatively unskilled.
Just look at this scene: HALO 4 Spartan Ops | "Episode 6" Full Cinematic (2013) [EN] | HD - YouTube
Sangheili Aristocrats (ones that can use a sword) are supposed to train in Swordplay since the moment they can stand. As with ALL young Sangheili training, this training is deadly, so that those without skill do not survive and only those skilled enough can wield a blade.
And yet they act like bumbling buffoons, can hardly manage to fend off a RECRUIT Spartan IV (who has never held an energy sword before I might add), and otherwise completely humiliate themselves.
Another example? (Spoiler alert) a Sangheili Zealot, considered to be some of the most skilled, experienced, best warriors of the Sangheili race, fights Agent Locke in episode 1 of Halo Nightfall. In it, Locke wasn’t even a Spartan IV, he was a regular ONI Agent. The Zealot couldn’t even touch Locke, despite numerous canonical examples saying Sangheili can match a Spartan-II in terms of strength and speed. Realistically, the Zealot should have torn through Locke like a bulldozer through plasticard! But plot demanded he live, so instead the Zealot barely seemed to understand how to swing a sword, gave up after a brief fight, ran away, and then when ambushed could do nothing but stand there while Locke jumped on his head and fired at him several times in the face until the shields broke.
Sangheili are meant to be Strong, Agile, highly skilled warriors. If they aren’t skilled enough to fight properly they generally die in the training. Halo 2 Annaversary’s cutscenes and Terminal videos captured this perfectly. They were shown as highly skilled and cunning warriors and are a thing to be respected.
So why is everything else showing them as just being big, slow, and stupid?