Soundtracks for BG:EE, SoD, BG2:EE, IWD:EE, PST:EE are now available
in the Beamdog store.
So the minimum wisdom for a blackguard is 3 unlike for a regular paladin which must have 13.
Is there any disadvantage to having 3 wisdom? As far as I know no paladin or ranger kits gain bonus spells from wisdom as that is a strict benefit for clerics and Druids.
Also there is no spell casting failure like in pnp.