While I mostly agree with you it surprises me you'd leave out
warped headband of intellect which coupled with how anyone can use Wizard scrolls just doesn't feel right.
Also with that meta knowledge you could just go roll any class with total disregard for intellect -even Wizard potentially (true he's then bound to wear the headband for life and could never go over 18 but it's still a bit too good of a deal IMO)
Lol actually missed that item because I had them work as mercenaries for me. Early game good but not OP, at lvl 4 id have int 18 regardless with a mage.
Also you have to beat an ogre for it and only has 1 effect, setting your int to 18. If it would do things alongside that id agree that is abit much.