yep, i hate them too a lot, non halo and people who like them are as you told, i also notice people are losing braincells, like in mp if they are looking at you and staring at you they always shoot you, that is not friendly while in gears of war if they stare at you they are friendly, people now are so wrong and dumb and have only 1 braincell, and those buy cat ears and trash anti halo cosmetics without even thinking about it, mindless zombies. they are wrong and dumb. those who do have common sense and mentality i usually find on the classic good games.
i think they know modern games are brainwashed cash grab machines and have the smart mentality to stick to the good real games , and so am i.
then there are a lot crap items such as that meownjir charm, there is even a new bot of it.
i missed halo 5 so when i came here charms were new to me, there were not many skins/coating yet, but as more and more appear, some look maybe good, but a lot especially the charms and anti halo cores like that samurai which i also hate and didnt play that event look bad.
i have just one thing in mind, at the description of those anti halo cosmetics are written, weared by ( this and that team and moment ) in the fight against ( this and that ), but… I NEVER HAVE SEEN in the campaigns spartan soldiers wearing those goofy crap items, dare to see a yokai armor soldier in a campaign or a spartan in a campaign story wearing those goofy stuff. never seen it.
i temporary weared that rakshaka armor because of a coating i liked but then i felt i wasnt a spartan anymore and looking at my teammates wearing mark v or vii i tought, hm nooo i switch back too to my original true spartan core so i play as a spartan again.
as more goofy items appear and i feel it when im running in live fire i feel more im carrying a barbie princess glitter dress with me.
and a new item term 
OUR WEAPONS ARE PRINCESS WANDS!!
when im running with it it feels im carrying a princess wand with all the if someone has attached weird cosmetics to it, glittery princess wand staff. and kill effects? the magic that comes out of the fairy wand staff.
i like the catalyst map but i hope future maps wont become Princess castles!!
but what i would like if new maps come, there should be smashable objects like bottles in bazaar , its fun to shoot them off the racks, and boxes or like the fruit in bazaar