About the 1st boss drop I've meant that weapon is way worse than fully/decently upgraded master tier staff. Generally the issue is; the weapon cannot be upgraded. It shoots one projectile, where any 2/3lvl tier staff with upgrades will cover wider area and deal more damage, because they are upgraded. Unless I am missing something about the weapon.
And is frozen enemy supposed to deal contact damage and able to attack? It would made more sense (logically at least) if it stopped enemy from dealing damage, but it's fine if mage crowd control is supposed to root enemies.