i instead missed A LOT inventory and loot in ME2 and ME3. It felt like there is nothing rewarding you for your efforts. I welcomed the DAI loot and crafting system because it encourage you to explore more and check everywhere for secret chests and items. Since exploration is going to be a thing in the next ME then loot and chests are the only way to make exloring planets worthwhile aside from secondary quests. Crafting should take inspiration from Dead Space 3 minus the pesky microtransactions, those should be burnt with fire.
I think the DAI system is quite nice though some modifications are required:
-Reduce the overall randomness of what are you going to get.
-Make the items you find in chests linked to your level. Create a tier system of chests. Where rare chest are hidden and difficult to spot or protected by some kind of tough enemy.
-Make secondary quests the most rewarding in terms of items obtained.
-Create shops around the game where we can purchase weapons or weapon parts for a hefty sum. Therefore we have to sell loots, items and valuables to get what we want. Credits should be scarse enough to force us prioritizing our choice so that we simply aren't able to buy 100% of the weapons or their mods.
Enhance weapon customization where you can buy/find a Mattock but in order it to make a great gun you have to purchase or obtain rare weapon parts.
These are just some ideas. I take great pleasure in exploring, finding chests, farming valuables and earn my guns. This greatly enhance replayability for me. I really did not like how in ME2/3 you didn't have any loot and collectibles, but then those games didn't have any exploration to begin with....BW catering to lazy players.
And for the love of God, BW balance well your weapon packs this time around or even better put your new weapons inside the story DLCs.