Well if you look at the customization in Halo since the first game. It went like this:
Halo:CE (I think)Change Emblem
Halo 2: Change spartan color and emblem, also use Elites.
Halo 3: Change color, emblem, and armor.
Halo REACH: Completely pimp out your armor, colors, armor effects, voice, etc.
Halo 4: Weapon customization, color and camo and armor customization.. and etc.
Halo is just advancing in the customization. it has been in all of the games. I am fine with this, it doesn't really bother me, nor does it make me thrilled. It is just an advanced customization like Halo has always brought forward in each game.