Each of the campaign characters have their own unique HUD that makes it exciting to play as them. I find it strange that there isn’t an option to pick which of the 8 HUDs you’d like to use in multiplayer. Would be trivial to add, but would definitely be a nice addition. Wink wink, 343.
It was discussed early on in development, but 343 decided that for multiplayer it would be better to keep things as level as possible. That’s the brief version, I think it was Sprint episode 4 or 5 that they spoke about it more 