I feel like this would be good as well, if not at launch then at least as a patch down the road. Probably wouldn't be a good idea to change subclass though. While it would be great for customization/replayability, I feel that those who don't want this to be "Divinity Original Sin 3" would be disappointed.
I don't want DoS3 but I'd really like to be able to change my companion's subclass if it does not conflict with their story.
The problem is that both Wyll and Shadowheart are bound by their subclass.
In the case of Shadowheart, they would have to add a domain outside of phb which is not likely to happen.
