Fireshield requires that you be in melee contact with the enemy. As this is not an ideal situation, we will want to minimise such incidents, which means that Fireshield will rarely be used.
Unless you belong to the school of thought that tool up Mages to be literally balls of pain (as in you use your Mages to be invulnerable tanks, so you use Fireshields as well to return back some damage).
Unless Tom-Slayer is a soloist, True Sight will mean a wasted spell slot as other party members can cast True Sight (Clerics, other Mages, Inquisitors, Book of Many Spells, and Bards).
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