I have seen some theories about Larian doing this to actualy prevent us to steal Lae'zel or Shadowheart starting gear ...
Even if we put aside the fact that we still can and quite easily ...
Wouldnt be easier to simply implement "Equipable by Lae'zel only" condition? O_o
Yes it would be easier.
Doing so wouldn't prevent players from using Lae'zel as a pack mule, but is that really a problem?