This is one of the reasons I wanted to make a new UI. I have already retroactively added all the old items to it, like the stuff you find on the Derelict:
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This will not only serve the obvious purpose of immersion and as a storage for your outfits but also as a way to keep a check on what you find during your adventures, about items you will be later (in R7) able to sell at the Market (this is also why there is item rarity).
However, there is also the functionality tied with the future point-and-click mechanics; during the exploration, you'll be able to use certain items at certain moments to either get some extra money, find some extra loot, or get an extra scene!
And all of this is tied together with the change of pace (a lot more exploration) in later portions of the game!
As for Stretchers, there is most certainly a lot more content waiting for them. The same applies to more Giger-inspired stuff that's in the works!