I think it's little more than Larian trying to make a custom character feel less dull and generic in comparison to the origin companions (all potential player characters). Larian promised their fans that BG3 would deviate from D:OS2 in this after all and this is a small sign of them being true to their word. Doubt it will be anywhere near as tangible as the paladin mechanic, but its a welcome nod to immersive roleplaying nonetheless.