The amount and quality of content is incredible, but something I would love is more entirely unique effects, whether it is in some items, traps, interactables, terrain. Most existing effects have an equivalent somewhere, so when you encounter for example a new magic item you can expect it to either: cast a spell that can be obtained elsewhere, have an interaction with a status effect that exists elsewhere, modify an existing stat (including skill points and carry size), etc.
What I'd love is some new items/traps/interactables that introduce totally non duplicated and suprising mechanics, that don't have to be ultra ambitious either, but are really unique. A grapping hook that increases damage/to-hit proportionnally to the number of hugged walls and decreases it when surrounded by air. Boots that create pools of hot coals x% of steps and increase fire induced damage. A fountain that gives a permanent mutation that would be akin to a passive effect perk. A blank spell book that shifts its effect depending on the number of spells memorized, or not memorized, triggering a weird choice of investing in memory while not learning spells. Etc!