In the campaign, 343 introduced a much needed concept…Spartan Armor lock. This allows your armor to go into lockdown in order to protect you while help is on the way. This is fantastic! This needs to be in Warzone. There is a lore related reason for this, too. Although, it was never fully utilized, Marines were trained on repairing/ maintaining Spartan armor in the books. It only makes sense that Spartan know how to do this, too.
It would just cut down on so much unneeded field traversing when you die and get sent back to spawn. Of course, some injuries are non-revivable situations in the campaign and that should remain true in Warzone.