It'd be amazing if we could check all characters, their traits with subpaths, all abilities and their traits/upgrades in form of a book in the camp. Lore-wise it could be a mystical artifact, a Tome of Knowledge or a sage-guide NPC that lets you check out all unlocked stuff, their % stats etc. Options could be greyed out until unlocked and taken at least once in the game (if you take any subpath of a trait at lvl V for example it shows you all subpaths of that level for that trait, and so on).
As of right now I always use wiki and minimize constantly, I do however believe it'd be much more pleasant if the game had its own encyclopedia built-in. It would also be always up to date.