I don't think people are ready for this level of realism. Its why most people don't like Art. Art is work.
I'm sorry, but seeing Shadowheart being written as a stereotypical tsundere character and trying to see that as "realism" or "art" is just...wow. I can't do it. You don't have to love Harry Potter ( i do! ) but saying these characters are art but Harry Potter characters childish or something is incorrect imo.
You're putting words in my mouth. Harry Potter isn't necessarily childish. It's just not literature. Its fun, you can sit back and enjoy it and the journey but you don't need to step inside it and analyze anything.
Shadowheart, Gale, Lae'zel and Wyll are more like regular people. They have problems. They are at times unlikable. They have their own motivations you have to deal with. You can't always trust what they say. Gale has a stupid mustache, and you have to try and watch him say things with his dumb face and not punch him.
Astarion is the most "go with the flow" option. As long as SOMETHING is dying he doesn't care much.
Compared to Minsc who is a simpleton - "You point, I punch!"