In fact, if I were a BG2 fanatic, I'd start a "PoE2 demands" thread on the Obsidian forums right now, asking for mage duels, asking for multiple strongholds, etc.
Who would ask multiple strongholds when they couldn't do one right? Mage duels ain't gonna happen with that magic system, and I'm not confident on their ability to even understand the genius of Baldur's Gate II itemization.
Based on what we got, I would ask them to make companion quests & interactions more meaningful. In BG2 Misnc could become Aeris protector, Edwin would turn into a woman, Keldorn could retire,
Amoen could pass or fail the paladin's test and them even become a vampire and die (and resurrected later)... plus all the party banter & alignment restrictions.
But Josh "no failure" Sawyer would never allow a party member to abandon players, and they don't even have MCA anymore...