Seriously stop sayin BS because you like a feature lol. No Gale as a Barbarian, Shadowheart as a Druid and Lae'Zel as a bard does not make any sense story-wise.
I also thought that multiclassing would have been enough... But it looks like Larian does not care to offer companions a narrative that doesn't make any sense for the sake of gameplay choices. Definitely something I'm not in line with.
That said in a comment : fextralife said that he talked about it with devs and that they were not sure if this would be in the game at release or not.
All of those make perfect sense to me.
Right.... Gale the barbarian tried to cast magic too powerful for him (= a cantrip?) and had an accident... Wyll the fighter made a pact with a devil for power. Which power exactly? Shadowheart the devouted follower of Shar. Who is a cleric of Torm......