We can also see from the Fighter's Action Surge how in BG3 one (legit) extra action can lead to trivializing encounters. OP stealth, abundant invisibility potions and poison/dipping combined with Action Surge create insane alpha strikes that murder bosses before they even get a turn.

Now that's going to be a lot worse on a high level Sorcerer who can cast two powerful spells per turn.

I noticed from the latest PFH that Swen likes to play this way himself, using meta knowledge (characters preparing for enemies they don't yet know are there, or stealing quest items from them). Metagaming is relevant because a lot of players are going to play this way too even if they might now particularily enjoy it, like myself. But you can't forget an encounter you know will be there. I think Larian should minimize the usefulness of this kind of metagaming knowledge to keep things fresh, interesting and also challenging. Make these enemies more aware and harder to surprise, especially bosses. I'd like more fair fights instead of puzzle fights that won't be a challenge after you crack the puzzle the first time.

Sorcerers doing Quickened double spells surprises from stealth will just mow through everything especially when you know what to expect.