A couple of thoughts for this topic... Sorry if this gets long, just jotting down all the thoughts I had.
--Include a little badge of what the item type is in the item deion. Something like the Broken Heart Shards sure don't look like food items, and the deion says nothing of it being edible, yet they are consumable and part of food items/nourishment. And again, something like the Blue Water Bottle (which is sold in a shop where everything is food but these water bottles) is not consumable. (I believe the water bottles are also a part of the food quest but cannot confirm at this time, my memory could be wrong).
--Follow up thought from the last point - perhaps in the item database an item could say if it could be asked for in a certain quest or not. (Thinking of items that will stock in the food shops and are legendary like the Cucumber, but I assume those will never be a part of the Food Quest). And/or perhaps you could check the rarity of an item you own right from your inventory, or even be able to sort by rarity like you can in NPC shops.
--Provide access to the library again? I know you used to be able to put one of each book into it and see all the books you had in your library and read them to creatu that way, but I haven't been able to find it in a while and I don't know if that still exists so all of my books are just chilling in my inventory, which can get kinda annoying for sorting and stocking purposes. Not sure if I missed why/when it was removed or if I'm just... not look in the right spot. **same with the squishy shelf which I believe is still a thing. I have not a clue where it could be or if it still exists**
--Scratch that, found them. I think putting a link in the inventory would be a better idea than where those links are, personally, especially since a link to the clothing rack is also in the inventory.
--Include in an item's deion what it might do if it isn't already stated. Dye kits are nice in that way because they specifically tell you what will happen, but something like Ice Apples do not say what they do in their deion and can be easily missed. Also things like Alert items don't seem to say what they are used for in their deions.
--(tentative suggestion, not sure if this would be too useful) Include a 'Quest' item sub-section (like we have food, weapons, etc.). For items like the planet activities (like bird catching). Again, there may be others I can't think of, but I think this could potentially be useful. I guess there could also be other sections instead of 'quest' but it feels like we have a tooon of items dumped into the 'Other' category. I do notice that in the item database there are items like the Curse of the Undead who have a special type (like the curse having 'Heal' listed as its item type), so I wonder if this could also be included in inventory sorting purposes.
**for the purpose of spelling and grammar/reading ease, assume all words that got changed to "deion" say "descrip.tion" without the period in the middle of the word.