T3 chests have the following
<lootgroup name="groupReinforcedChestT3" count="all">
<item group="groupReinforcedChestT3_01" count="1"/> <!-- Ammo -->
<item group="groupReinforcedChestT3_02" count="1"/> <!-- Weapon OR Armor -->
<item group="groupReinforcedChestT3_03" count="1"/> <!-- Medical -->
<item group="groupReinforcedChestT3_04" count="1"/> <!-- Mods -->
<item group="groupReinforcedChestT3_05" count="1"/> <!-- Books/Schematics -->
<item group="groupReinforcedChestT3_06" count="1"/> <!-- Bonus Items -->
</lootgroup>
I think this would unbalance the game at the beginning. If you are lucky (and really not hard to find some lower level tier POIs with gun safes) and find a few picks, you can get a ton of stuff early game.