I mean i agree that this is most probably oversight ...
Or at least i hope so. :-/
But if you really, and i mean REALLY wanted to make this work somehow ...
Aka what people around here call make some headcanon over mechanic:
You could simply say that while Clerics are getting their blessin out of Deity, Wizards are simply mimicing the effect ... i mean the way Deity gives its power to Cleric is through the Weave, since its working like conduit ... therefore Wizard that will be able to mimic the same effect on Weave should theoreticaly be able to recreate same effect without Deity at its Origin.
What puzzles me more is how is that possible that Life Cleric of Baal is (even able to exist in the first place) able to deliver Blessing from his Deity to help some injured weakling. :-/
Well... A cleric of Baal healing someone, would only happen so they could torture/murder him slower? xD the Lord of Murder and pastries, according to Larian? xD
