Halo 5 sound design

I’ve seen a lot of people post about the good sound design before but I’m confused what is good about it.

People say to wear headphones because it will help to hear near by enemies but I don’t find this to be true I cant really notice any thing but in other games I can like overwatch for instance I feel there sound design is very 3 dimensional.

If any thing I play better when I mute the game.

I think they typically refer to the weapons when people are complimenting Halo 5’s sound design. Pretty much everything sounds distinct and identifiable when fired and when a shot connects.