I always liked the map used in Ultima Underworld - felt like a proper map that an adventurer might hand draw

But yeah inventory management is a pain, way too much stuff that seems and probably is useless. Some of it likely to do with crafting that has yet to be included such as all the mushrooms and herbs etc. Some of it seems to be just left over from the previous Larian game system.
Not entirely sure why they think finding knives and forks all over the place adds to the fun or sense of realism.
You can sort stuff based on how recently it was received or by type, but yeah a better way of highlighting new stuff since you last opened your inventory would be good. And being able to sell all the useless stuff in one go would also be good, and using whichever character gets the best deal rather than have to move inventory around to a particular character.
Books might be tied to achievements (assuming there are any), and some of them seemed relevant to various quests that can't resolved in this act (like letters for someone found on a dead body). So i try and read all of them, just in case, but sell almost all of the books/letters and keep a few that seem possibly useful.