Need deeper customization, flood + rumblepit

Besides dreading trying to complete halo 4 SLASO all over again. Anyone else disappointed about the lack of customizations for players? I love how you can customize your player for each halo but I would figure you would be able to change more then the Armor Style. Like be able to change helmets with different body armor and shoulders.

Please bring back rumble pit like in halo 4! Games like husky raid were very fun! As well as flood!

Thoughts?